21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI74FCT16245T
PI74FCT162245T
PI74FCT162H245T
Fast CMOS 16-Bit
Bidirectional Transceivers
Product Features
Common Features
• PI74FCT16245T, PI74FCT162245T and PI74FCT162H245
are high-speed, low-power devices with high-current drive
• V
CC
= 5V ± 10%
• Hysteresis on all inputs
• Packages available:
– 48-pin 240 mil wide plastic TSSOP (A48)
– 48-pin 173 mil wide plastic TVSOP (JEDEC TSSOP K48)
– 48-pin 300 mil wide plastic SSOP (V48)
PI74FCT16245T Features
• High output drive: I
OH
= –32mA; I
OL
= 64mA
• Power off disable outputs permit “live insertion”
• Typical V
OLP
(Output Ground Bounce)
< 1.0V at V
CC
= 5V, T
A
= 25°C
PI74FCT162245T Features
• Balanced output drivers:
±24mA
• Reduced system switching noise
• Typical V
OLP
(Output Ground Bounce)
< 0.6V at V
CC
= 5V, T
A
= 25°C
PI74FCT162H245T Features
• Bus Hold retains last active bus state during Three-State
• Eliminates the need for external pull-up resistors
Product Description
Pericom Semiconductor’s PI74FCT series of logic circuits are
produced using the Company’s advanced 0.6 micron CMOS
technology, achieving industry leading speed grades.
The PI74FCT16245T, PI74FCT162245T, and PI74FCT162H245T
are 16-bit bidirectional transceivers designed for asynchronous
two-way communication between data buses. The direction control
input pin (xDIR) determines the direction of data flow through the
bidirectional transceiver. The Direction and Ouput Enable controls
are designed to operate these devices as either two independent
8-bit transceivers or one 16-bit transceiver. The output enable (OE)
input, when HIGH, disables both A and B ports by placing them in
HIGH Z condition.
The PI74FCT16245T output buffers are designed with a Power-
Off disable allowing “live insertion” of boards when used as
backplane drivers.
The PI74FCT162245T has
±24mA
balanced output drivers. It is
designed with current limiting resistors at its outputs to control the
output edge rate resulting in lower ground bounce and undershoot.
This eliminates the need for external terminating resistors for most
interface applications.
The PI74FCT162H245T has “Bus Hold” which retains the input’s
last state whenever the input goes to high-impedance preventing
“floating” inputs and eliminating the need for pull-up/down resistors.
Logic Block Diagram
1
DIR
1
OE
1
A
0
1
B
0
1
A
1
1
B
1
1
A
2
1
B
2
1
A
3
1
B
3
1
A
4
1
B
4
1
A
5
1
B
5
1
A
6
1
B
6
1
A
7
1
B
7
2
A
7
2
B
7
2
A
6
2
B
6
2
A
5
2
B
5
2
A
4
2
B
4
2
A
3
2
B
3
2
A
2
2
B
2
2
A
1
2
B
1
2
A
0
2
B
0
2
DIR
2
OE
1
PS2032D
05/17/99
Product Pin Description
Pin Name
xOE
xDIR
xAx
xBx
GND
V
CC
Description
3-State Enable Inputs (Active LOW)
Direction Control Input
Side A Inputs or 3-State Outputs
(1)
Side B Inputs or 3-State Outputs
(1)
Ground
Power
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI74FCT16245T/162245T/162H245T
Fast CMOS 16-Bit Bidirectional Tranceivers
Truth Table
Inputs
(1)
xOE
xDIR
L
L
L
H
H
X
Outputs
(1)
Bus B Data to Bus A
Bus A Data to Bus B
High Z State
Note:
1. For the PI74FCT162H245T, these pins have “Bus Hold.”
All other pins are standard, outputs, or I/Os.
Note:
1. H = High Voltage Level, X = Don’t Care,
L = Low Voltage Level, Z = High Impedance
Product Pin Configuration
48-Pin
V48
A48
K48
2
PS2032D
05/17/99
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21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI74FCT16245T/162245T/162H245T
Fast CMOS 16-Bit Bidirectional Tranceivers
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
Storage Temperature ........................................................... –65°C to +150°C
Ambient Temperature with Power Applied .......................... –40°C to +85°C
Supply Voltage to Ground Potential (Inputs & V
CC
Only) .. –0.5V to +7.0V
Supply Voltage to Ground Potential (Outputs & D/O Only) –0.5V to +7.0V
DC Input Voltage .................................................................. –0.5V to +7.0V
DC Output Current ............................................................................. 120mA
Power Dissipation ................................................................................... 1.0W
Note:
Stresses greater than those listed under MAXIMUM
RATINGS may cause permanent damage to the
device. This is a stress rating only and functional
operation of the device at these or any other condi-
tions above those indicated in the operational
sections of this specification is not implied.
Exposure to absolute maximum rating conditions for
extended periods may affect reliability.
DC Electrical Characteristics
(Over the Operating Range, T
A
= –40°C to +85°C, V
CC
= 5.0V
±10%)
Parameters
V
IH
V
IL
I
IH
I
IH
I
IH
I
IH
I
IL
I
IL
I
IL
I
IL
I
BHH
I
BHL
I
OZH
(5)
I
OZL
(5)
V
IK
I
OS
I
O
V
H
Description
Input HIGH Voltage
Input LOW Voltage
Input HIGH Current
Input HIGH Current
Input HIGH Current
Input HIGH Current
Input LOW Current
Input LOW Current
Input LOW Current
Input LOW Current
Bus Hold
Sustain Current
High Impedance
Output Current
Clamp Diode Voltage
Short Circuit Current
Output Drive Current
Input Hysteresis
Test Conditions
(1)
Guaranteed Logic HIGH Level
Guaranteed Logic LOW Level
Standard Input, V
CC
= Max.
Standard I/O, V
CC
= Max.
Bus Hold Input
(4)
, V
CC
= Max.
Bus Hold I/O
(4)
, V
CC
= Max.
Standard Input, V
CC
= Min.
Standard I/O, V
CC
= Min.
Bus Hold Input
(4)
, V
CC
= Min.
Bus Hold I/O
(4)
, V
CC
= Min.
Bus Hold Input
(4)
, V
CC
= Min.
V
CC
= Max.
V
CC
= Max.
V
CC
= Min., I
IN
= –18mA
V
CC
= Max.
(3)
, V
OUT
= GND
V
CC
= Max.
(3)
, V
OUT
= 2.5V
Min.
2.0
V
IN
= V
CC
V
IN
= V
CC
V
IN
= V
CC
V
IN
= V
CC
V
IN
= GND
V
IN
= GND
V
IN
= GND
V
IN
= GND
V
IN
= 2.0V
V
IN
= 0.8V
V
OUT
= 2.7V
V
OUT
= 0.5V
0.8
1
1
±100
±100
–1
–1
±100
±100
–50
+50
1
–1
–1.2
–200
–180
Typ.
(2)
Max.
Units
V
V
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
V
mA
mA
mV
–80
–50
–0.7
–140
100
Notes:
1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at V
CC
= 5.0V, +25°C ambient and maximum loading.
3. Not more than one output should be shorted at one time. Duration of the test should not exceed one second.
4. Pins with Bus Hold are identified in the pin description.
5. This specification does not apply to bi-directional functionalities with Bus Hold.
3
PS2032D
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21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI74FCT16245T/162245T/162H245T
Fast CMOS 16-Bit Bidirectional Tranceivers
PI74FCT16245T Output Drive Characteristics
(Over the Operating Range)
Parameters
V
OH
Description
Output HIGH Voltage
Test Conditions
(1)
V
CC
= Min., V
IN
= V
IH
or V
IL
I
OH
= –3.0mA
I
OH
= –15.0mA
I
OH
= –32.0mA
I
OL
= 64mA
Min.
2.5
2.4
2.0
—
Typ.
(2)
3.5
3.5
3.0
0.2
—
Max.
Units
V
V
OL
I
OFF
Output LOW Voltage
Power Down Disable
V
CC
= Min., V
IN
= V
IH
or V
IL
V
CC
= 0V, V
IN
or V
OUT
≤4.5V
0.55
±100
V
µA
PI74FCT162245T/162H245T Output Drive Characteristics
(Over the Operating Range)
Parameters Description
V
OH
V
OL
I
ODL
I
ODH
Output HIGH Voltage
Output LOW Voltage
Output LOW Current
Output HIGH Current
Test Conditions
(1)
V
CC
= Min., V
IN
= V
IH
or V
IL
I
OH
= –24.0mA
V
CC
= Min., V
IN
= V
IH
or V
IL
I
OL
= 24mA
V
CC
= 5V, V
IN
= V
IH OR
V
IL
, V
OUT
= 1.5V
(3)
V
CC
= 5V, V
IN
= V
IH OR
V
IL
, V
OUT
= 1.5V
(3)
Min.
2.4
60
–60
Typ.
(2)
3.3
0.3
115
–115
Max.
0.55
150
–150
Units
V
V
mA
mA
Capacitance
(T
A
= 25°C, f = 1 MHz)
Parameters
(4)
C
IN
C
OUT
Description
Input Capacitance
Output Capacitance
Test Conditions
V
IN
= 0V
V
OUT
= 0V
Typ.
4.5
5.5
Max.
6
8
Units
pF
pF
Notes:
1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at Vcc = 5.0V, +25°C ambient and maximum loading.
3. Not more than one output should be shorted at one time. Duration of the test should not exceed one second.
4. This parameter is determined by device characterization but is not production tested.
4
PS2032D
05/17/99
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21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI74FCT16245T/162245T/162H245T
Fast CMOS 16-Bit Bidirectional Tranceivers
Power Supply Characteristics
Parameters Description
I
CC
∆I
CC
I
CCD
Quiescent Power
Supply Current
Supply Current per
Input @ TTL HIGH
Supply Current per
Input per MHz
(4)
Test Conditions
(1)
V
CC
= Max.
V
CC
= Max.
V
CC
= Max.,
Outputs Open
X
OE = xDIR = GND
One Bit Toggling
50% Duty Cycle
V
CC
= Max.,
Outputs Open
f
I
= 10 MH
Z
50% Duty Cycle
X
OE = xDIR = GND
One Bit Toggling
V
CC
= Max.,
Outputs Open
f
I
= 2.5 MH
Z
50% Duty Cycle
X
OE = xDIR = GND
16 Bits Toggling
V
IN
= GND or V
CC
V
IN
= 3.4V
(3)
V
IN
= V
CC
V
IN
= GND
Min.
Typ.
(2)
0.1
0.5
60
Max.
500
1.5
100
Units
µA
mA
µA/
MHz
I
C
Total Power Supply
Current
(6)
V
IN
= V
CC
V
IN
= GND
0.7
2.5
(5)
mA
V
IN
= 3.4V
V
IN
= GND
V
IN
= V
CC
V
IN
= GND
0.9
2.5
3.3
(5)
5.5
(5)
V
IN
= 3.4V
V
IN
= GND
6.5
17.5
(5)
Notes:
1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device.
2. Typical values are at Vcc = 5.0V, +25°C ambient.
3. Per TTL driven input (V
IN
= 3.4V); all other inputs at Vcc or GND.
4. This parameter is not directly testable, but is derived for use in Total Power Supply Calculations.
5. Values for these conditions are examples of the Icc formula. These limits are guaranteed but not tested.
6. I
C
=I
QUIESCENT
+ I
INPUTS
+ I
DYNAMIC
I
C
= I
CC
+
∆I
CC
D
H
N
T
+ I
CCD
(f
CP
/2 + f
I
N
I
)
I
CC
= Quiescent Current
∆I
CC
= Power Supply Current for a TTL High Input (V
IN
= 3.4V)
D
H
= Duty Cycle for TTL Inputs High
N
T
= Number of TTL Inputs at D
H
I
CCD
= Dynamic Current Caused by an Input Transition Pair (HLH or LHL)
f
CP
= Clock Frequency for Register Devices (Zero for Non-Register Devices)
f
I
= Input Frequency
N
I
= Number of Inputs at f
I
All currents are in milliamps and all frequencies are in megahertz.
5
PS2032D
05/17/99
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