ADVANCE INFORMATION
PI74LVC3245A
8-Bit Dual Supply Bus Transceiver
with 3-State Outputs
Product Features
2.7V to 3.6V on A-port and 4.5V to 5.5V on B-port
TTL Compatible Inputs
Latch-up performance exceeds 200mA Per JESD78
ESD protection exceeds JESD22
2000V Human-Body Model (A114-B)
200V Machine Model (A115-A)
• Industrial Temperature: –40°C to +85°C
• Available Packages:
24-pin 173-mil wide plastic TSSOP (L)
24-pin 150-mil wide plastic QSOP (Q)
24-pin 300-mil wide plastic SOIC (S)
•
•
•
•
Product Description
Pericom Semiconductor’s PI74LVC series of logic circuits are
produced using the Company’s advanced submicron CMOS tech-
nology, achieving industry leading speed.
The PI74LVC3245A is a non-inverting 8-bit Bidirectional Trans-
ceiver that uses two seperate power supply rails. A-port (V
CCA
)
is set to operate at 3.3V and B-port (V
CCB
) is set to operate at 5V.
This allows for translation from a 3.3V to a 5Venvironment and
vice-versa. This tranceiver is designed for asynchronous two-way
communication between data buses. The direction control input pin
(DIR) determines the dataflow from the A bus to the B bus or from
the B bus to the A bus. The output enable (OE) input, when HIGH,
disables both A and B ports by placing them in HIGH Z condi-
tion.
Logic Block Diagram
DIR
2
22
Product Pin Configuration
OE
(3.3V) V
CCA
DIR
A1
A2
A3
A4
A5
A6
A7
A8
GND
GND
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
V
CCB
(5V)
NC
OE
B1
B2
B3
B4
B5
B6
B7
B8
GND
A
1
3
A
2
4
A
3
5
A
4
6
A
5
7
A
6
8
A
7
9
A
8 10
21
B
1
20
B
2
19
18
17
16
B
3
B
4
B
5
B
6
15
B
7
14
B
8
Product Pin Description
Pin Name
OE
Outputs
DIR
Ax
Bx
NC
GND
V
CCA
,V
CCB
Description
3-State Output Enable Inputs (Active LOW)
Direction Control Input
Side A Inputs or 3-State Outputs
Side B Inputs or 3-State Outputs
NO Internal Connect
Ground
Power
Truth Table
(1)
Inputs
OE
L
L
H
DIR
L
H
X
Bus B Data to Bus A
Bus A Data to Bus B
Z (Isolation)
L = Low Signal Level
Z = High Impedance
1
Note:
1. H = High Signal Level
X = Don’t Care or Irrelevant
P-0.3
08/05/03
ADVANCE INFORMATION
PI74LVC3245A
8-Bit Dual Supply Bus Transceiver
with 3-State Outputs
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
Supply voltage range, V
CCA
and V
CCB ............................
–0.5V to +7V
Input voltage range, V
I(2)
: I/O ports (A-port)
....
–0.5V to V
CCA
+0.5V
I/O ports (B-port)
...........
–0.5V to V
CCB
+0.5V
Control Pins
.................
–0.5V to V
CCA
+0.5V
Input clamp current, I
IK
(V
I
<0)................................................–50mA
Output clamp current, I
OK
(V
O
<0)...........................................–50mA
Continous Output Current I
O
..................................................±50mA
Continous Current through each V
CC
or GND pin .....................±100mA
Package thermal impedance, θ
JA(3)
: package L...................... 84°C/W
package Q...................... 98°C/W
package S ...................... 79°C/W
Storage Temperature range, T
stg
................................–65°C to 150°C
Notes:
Stresses greater than those listed under MAXIMUM RATINGS may cause
permanent damage to the device. This is a stress rating only and func-
tional operation of the device at these or any other conditions 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.
2. This value is limited to 7V maximum.
3. The package thermal impedance is calculated in accordance with JESD
51.
2
P-0.3
08/05/03
ADVANCE INFORMATION
PI74LVC3245A
8-Bit Dual Supply Bus Transceiver
with 3-State Outputs
Recommended Operating Conditions
(4)
Parameters
V
CCA
V
CCB
V
IHA
V
IHB
V
ILA
V
ILB
Description
Supply Voltage
Supply Voltage
High-Level Input Voltage
High-Level Input Voltage
Low-Level Input Voltage
Low-Level Input Voltage
High-Level Input Voltage
(Control Pins)
V
OB
≤ 0.1v or
V
OB
≥ V
CCB
-0.1V
V
OA
≤ 0.1V or
V
OA
≥ V
CCA
-0.1V
V
OB
≤ 0.1V or
V
OB
≥ V
CCB
-0.1V
V
OA
≤ 0.1V or
V
OA
≥ V
CCA
-0.1V
V
OA
≤ 0.1V or
V
OA
≥ V
CCA
-0.1V,
V
OB
≤ 0.1V or
V
OB
≥ V
CCB
-0.1V
V
OA
≤ 0.1V or
V
OA
≥ V
CCA
-0.1V,
V
OB
≤ 0.1V or
V
OB
≥ V
CCB
-0.1V
2.7V
3.6V
3.3V
3.3V
2.7V
3.6V
3.3V
3.3V
2.7V
3.6V
2.7V
3.6V
5.0V
5.0V
4.5V
5.5V
5.0V
5.0V
4.5V
5.5V
4.5V
5.5V
4.5V
5.5V
0
0
0
0
2.7V
3V
3V
2.7V
3V
3V
4.5V
4.5V
4.5V
4.5V
4.5V
4.5V
2
2
0.8
0.8
V
CCA
V
CCB
V
CCA
V
CCB
-12
-24
-24
12
24
24
10
-40
85
ns/v
ºC
mA
V
CCA
V
CCB
Min.
2.7
4.5
2
2
2
2
0.8
0.8
0.8
0.8
V
Typ.
3.3
5
Max.
3.6
5.5
Units
V
IH
V
IL
V
IA
V
IB
V
OA
V
OB
I
OHA
I
OHB
I
OLA
I
OLB
∆t/∆v
T
A
Low-Level Input Voltage
(Control Pins)
Input Voltage
Input Voltage
Output Voltage
Output Voltage
High-Level Output Current
High-Level Output Current
Low-Level Output Current
Low-Level Output Current
Input transition Rise or Fall
Rate
Operating Free-Air Temp.
Note:
4. All unused inputs of the device must be held at the associated V
CC
or GND to ensure proper device operation.
3
P-0.3
08/05/03
ADVANCE INFORMATION
PI74LVC3245A
8-Bit Dual Supply Bus Transceiver
with 3-State Outputs
DC Electrical Characteristics
(Over the Operating Range, T
A
= –40°C +85°C)
Parameters
Description
Test Conditions
I
OH
= –100µA
V
OHA
Minimum High Level
Output Voltage (Port A)
I
OH
= –12mA
I
OH
= –24mA
V
OHB
Minimum High Level
Output Voltage (Port B)
Maximum Low Level
Output Voltage (Port A)
Maximum Low Level
Output Voltage (Port B)
Maximum Input Leakage
Current (Control Inputs)
Maximum 3-State Output
Leakage Current (A or B
ports)
Quiescent V
CCA
Supply Current
Quiescent V
CCB
Supply Current
I
CC
per input (A port)
I
OH
= –100µA
I
OH
= –24mA
I
OL
= 100µA
V
OLA
I
OL
= 12mA
I
OL
= 24mA
I
OL
= 100µA
I
OL
= 24mA
V
I
= V
CCA
or GND
V
I
= V
IL
or V
IH
, OE = V
CCA
V
O
= V
CCA/B
or GND
B to A, B-Port = V
CCB
or
GND, I
O
(A port) = 0
A to B, A port = V
CCA
or
GND, I
O
(B port) = 0
One input V
I
= V
CCA
–0.6V,
other inputs = V
CCA
or GND,
OE = GND and DIR = V
CCA
One input V
I
= V
CCA
–0.6V,
other inputs = V
CCA
or GND,
DIR = V
CCA
V
I
= V
CCA
–0.6V, other
inputs = V
CCA
or GND, OE
= GND
One Input V
I
= V
CCB
–2.1V,
other inputs = V
CCB
or
GND, OE = GND and DIR
= GND
V
CCA
3V
2.7V
3V
2.7V
3V
3V
3V
3V
2.7V
2.7V
3V
3V
3V
3.6V
V
CCB
4.5V
4.5V
4.5V
4.5V
4.5V
4.5V
4.5V
4.5V
4.5V
4.5V
4.5V
4.5V
4.5V
5.5V
Min.
2.9
2.2
2.4
2
2.25
4.4
3.76
Typ.
3
2.55
2.8
2.4
2.7
4.5
4.21
0.01
0.09
0.18
0.18
0.01
0.18
0.1
0.44
0.5
0.44
0.1
0.44
±1
V
Max. Units
V
OLB
I
I
I
OZ(5)
3.6V
5.5V
±5
µA
I
CCA
I
CCB
3.6V
3.6V
3.6V
5.5V
5.5V
5.5V
10
10
50
I
CC
per input (OE)
∆I
CC(6)
3.6V
5.5V
50
uA
I
CC
per input (DIR)
3.6V
5.5V
50
I
CC
per input (B Port)
3.6V
5.5V
0.7
1.5
mA
Notes:
5. For I/O ports, the parameter I
OZ
includes the input leakage current.
6. This is the increase in supply current for each input that is at one of the specified voltage levels, rather than 0V or the associated V
CC
.
4
P-0.3
08/05/03
ADVANCE INFORMATION
PI74LVC3245A
8-Bit Dual Supply Bus Transceiver
with 3-State Outputs
Capacitance
(T
A
= 25°C)
Param-
eters
C
IN
C
I/O
C
PD
Description
Control Input Capacitance
Input/Output Capacitance
(A or B port)
Power Dissipation
Capacitance
(7)
Test Conditions
V
I
= V
CCA
or GND, V
CCA
= Open, V
CCB
=Open
V
I/O
= V
CCA/B
or GND, V
CCA
= 3.3V, V
CCB
= 5V
Outputs Enabled
Outputs Disabled
V
CCA
= 3.3V, V
CCB
= 5V
C
L
= 0pF, f = 10MHz
Typ.
2.8
9
22
2.2
pF
Units
Notes:
7. C
PD
is defined as the value of the internal equivalent capacitance which is derived from dynamic operating current con-
sumption (I
CCD
) at no output loading and operating at 50% duty cycle, C
PD
is related to I
CCD
dynamic operating current
by the expression: I
CCD =
(C
PD
)(V
CC
)(f
IN
) +(I
CC
static)
AC Electrical Characteristics
(Over Operating Range, T
A
= –40°C to +85°C)
V
CCA
= 2.7V to 3.6V, V
CCB
= 5V ±0.5V
Parameters
t
PHL
t
PLH
t
PHL
t
PLH
t
PZL
t
PZH
t
PZL
t
PZH
t
PLZ
t
PHZ
t
PLZ
t
PHZ
t
SK(O)
From (Input)
To (Output)
C
L
= 50pF, R
L
= 500Ω
Min.
A
B
OE
OE
OE
OE
B
A
A
B
A
B
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
Max.
6.3
6.0
5.7
6.0
7.8
7.5
7.8
7.6
7.0
7.5
7.0
7.3
1.5
ns
Units
Output-to-Output Skew
(8)
Note:
8. Skew between any two outputs of the same device, switching in the same direction. Parameter guaranteed by design.
5
P-0.3
08/05/03
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