IDT74ALVCH162268
3.3V CMOS 12-BIT TO 24-BIT REGISTERED BUS EXCHANGER
INDUSTRIAL TEMPERATURE RANGE
3.3V CMOS 12-BIT TO 24-BIT
REGISTERED BUS EX-
CHANGER WITH 3-STATE
OUTPUTS AND BUS-HOLD
• 0.5 MICRON CMOS Technology
• Typical t
SK(o)
(Output Skew) < 250ps
• ESD > 2000V per MIL-STD-883, Method 3015; > 200V using
machine model (C = 200pF, R = 0)
• V
CC
= 3.3V ± 0.3V, Normal Range
• V
CC
= 2.7V to 3.6V, Extended Range
• V
CC
= 2.5V ± 0.2V
• CMOS power levels (0.4µ W typ. static)
µ
• Rail-to-Rail output swing for increased noise margin
• Available in TSSOP and TVSOP packages
IDT74ALVCH162268
FEATURES:
DESCRIPTION:
DRIVE FEATURES:
APPLICATIONS:
• High Output Drivers: ±24mA (A port)
• Balanced Output Drivers: ±12mA (B port)
• 3.3V high speed systems
• 3.3V and lower voltage computing systems
This 12-bit to 24-bit registered bus exchanger is built using advanced
dual metal CMOS technology. This device is used for applications in which
data must be transferred from a narrow high-speed bus to a wide, lower-
frequency bus.
The ALVCH162268 device provides synchronous data exchange be-
tween the two ports. Data is stored in the internal registers on the low-to-
high transition of the clock (CLK) input when the appropriate clock-enable
(CLKEN) inputs are low. The select (SEL) line is synchronous with CLK and
selects 1B or 2B input data for the A outputs. For data transfer in the A-to-
B direction, a two-stage pipeline is provided in the A-to-1B path, with a single
storage register in the A-to-2B path. Proper control of these inputs allows
two sequential 12-bit words to be presented as a 24-bit word on the B-port.
Data flow is controlled by the active-low output enables (OEA and
OEB).
These control terminals are registered to synchronize the bus-direction
changes with CLK.
The ALVCH162268 has series resistors in the device output structure of
the “B” port which will significantly reduce line noise when used with light
loads. This driver has been designed to drive ±12mA at the designated
threshold levels. The “A” port has a ±24mA driver.
The ALVCH162268 has “bus-hold” which retains the inputs’ last state
whenever the input bus goes to a high impedance. This prevents floating
inputs and eliminates the need for pull-up/down resistors.
FUNCTIONAL BLOCK DIAGRAM
CLK
29
2
CLKEN1B
27
CLKEN2B
30
CLKENA1
CLKENA2
OEB
55
C1
56
1D
C1
SEL
OEA
28
1D
1
1D
C1
CE
C1
1D
23
1
B
1
A
1
8
0
1
CE
C1
1D
6
2
B
1
CE
C1
1D
CE
C1
1D
CE
C1
1D
1 of 12 Channels
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
INDUSTRIAL TEMPERATURE RANGE
1
© 2004 Integrated Device Technology, Inc.
JANUARY 2004
DSC-4535/2
IDT74ALVCH162268
3.3V CMOS 12-BIT TO 24-BIT REGISTERED BUS EXCHANGER
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATION
OEA
CLKEN1B
2
B
3
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
Description
Max
V
TERM
(2)
Terminal Voltage with Respect to GND
–0.5 to +4.6
–0.5 to V
CC
+0.5
–65 to +150
–50 to +50
±50
–50
±100
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
OEB
CLKENA2
2
B
4
Unit
V
V
°C
mA
mA
mA
mA
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
V
TERM
(3)
Terminal Voltage with Respect to GND
T
STG
I
OUT
I
IK
I
OK
I
CC
I
SS
Storage Temperature
DC Output Current
Continuous Clamp Current,
V
I
< 0 or V
I
> V
CC
Continuous Clamp Current, V
O
< 0
Continuous Current through each
V
CC
or GND
GND
2
B
2
2
B
1
GND
2
B
5
2
B
6
V
CC
A
1
A
2
A
3
GND
A
4
A
5
A
6
A
7
A
8
A
9
GND
A
10
A
11
A
12
V
CC
1
B
1
1
B
2
V
CC
2
B
7
2
B
8
2
B
9
GND
2
B
10
2
B
11
2
B
12
1
B
12
1
B
11
1
B
10
NOTES:
1. Stresses greater than those listed under ABSOLUTE 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 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. V
CC
terminals.
3. All terminals except V
CC
.
CAPACITANCE
(T
A
= +25°C, F = 1.0MHz)
Symbol
C
IN
C
OUT
C
I/O
Parameter
(1)
Input Capacitance
Output Capacitance
I/O Port Capacitance
Conditions
V
IN
= 0V
V
OUT
= 0V
V
IN
= 0V
Typ.
5
7
7
Max.
7
9
9
Unit
pF
pF
pF
GND
1
B
9
1
B
8
1
B
7
NOTE:
1. As applicable to the device type.
FUNCTION TABLES
(1)
OUTPUT ENABLE
Inputs
CLK
↑
↑
↑
↑
OEA
H
H
L
L
OEB
H
L
H
L
Ax
Z
Z
Active
Active
Outputs
1Bx, 2Bx
Z
Active
Z
Active
V
CC
1
B
6
1
B
5
GND
1
B
3
GND
1
B
4
CLKEN2B
SEL
CLKENA1
CLK
TSSOP/ TVSOP
TOP VIEW
CLKENA1
H
L
L
X
X
A-TO-B STORAGE (OEB = L AND
OEA
= H)
Inputs
CLKENA2
H
L
L
L
L
CLK
X
↑
↑
↑
↑
Ax
X
L
H
L
H
1B
0
L
Outputs
1Bx
(2)
(3)
(3)
2Bx
2B
0
L
H
L
H
(2)
H
X
X
2
IDT74ALVCH162268
3.3V CMOS 12-BIT TO 24-BIT REGISTERED BUS EXCHANGER
INDUSTRIAL TEMPERATURE RANGE
FUNCTION TABLES
(CONTINUED)
(1)
B-TO-A STORAGE (OEA = L AND
OEA
= H)
Inputs
CLKEN1B
H
X
L
L
X
X
CLKEN2B
X
H
X
X
L
L
CLK
X
X
↑
↑
↑
↑
SEL
H
L
H
H
L
L
1Bx
X
X
L
H
X
X
2Bx
X
X
X
X
L
H
Output
Ax
A
0
A
0
(2)
(2)
L
H
L
H
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
Z = High Impedance
↑
= LOW-to-HIGH transition
2. Output level before the indicated steady-state input conditions were established.
3. Two CLK edges are needed to propagate data.
PIN DESCRIPTION
Pin Names
Ax
(1:12)
1Bx
(1:12)
2Bx
(1:12)
CLK
CLKENA1
CLKENA2
CLKEN1B
CLKEN2B
SEL
OEA
OEB
I/O
I/O
I/O
I/O
I
I
I
I
I
I
I
I
Description
Bidirectional Data Port A. Usually connected to the CPU's address/data bus.
(1)
(1)
Bidirectional Data Port 1B. Usually connected to the even path or even bank of memory.
Bidirectional Data Port 2B. Usually connected to the odd path or odd bank of memory.
Clock Input
(1)
Clock Enable Input for the A-1B Register. If
CLKENA1
is LOW during the rising edge of CLK, data will be clocked into register A-1B
(Active LOW).
Clock Enable Input for the A-1B Register. If
CLKENA2
is LOW during the rising edge of CLK, data will be clocked into register A-2B
(Active LOW).
Clock Enable Input for the A-1B Register. If
CLKEN1B
is LOW during the rising edge of CLK, data will be clocked into register 1B-A
(Active LOW).
Clock Enable Input for the A-1B Register. If
CLKEN2B
is LOW during the rising edge of CLK, data will be clocked into register 2B-A
(Active LOW).
1B or 2B Port Selection. When HIGH during the rising edge of CLK,
SEL
enables data transfer from 1B Port to A Port. When LOW
during the rising edge of CLK,
SEL
enables data transfer from 2B Port to A Port (Active LOW).
Synchronous Output Enable for A Port (Active LOW)
Synchronous Output Enable for A Port (Active LOW)
NOTE:
1. These pins have "Bus-Hold". All other pins are standard inputs, outputs, or I/Os.
3
IDT74ALVCH162268
3.3V CMOS 12-BIT TO 24-BIT REGISTERED BUS EXCHANGER
INDUSTRIAL TEMPERATURE RANGE
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Operating Condition: T
A
= –40°C to +85°C
Symbol
V
IH
V
IL
I
IH
I
IL
I
OZH
I
OZL
V
IK
V
H
I
CCL
I
CCH
I
CCZ
∆I
CC
Parameter
Input HIGH Voltage Level
Input LOW Voltage Level
Input HIGH Current
Input LOW Current
High Impedance Output Current
(3-State Output pins)
Clamp Diode Voltage
Input Hysteresis
Quiescent Power Supply Current
V
CC
= 2.3V, I
IN
= –18mA
V
CC
= 3.3V
V
CC
= 3.6V
V
IN
= GND or V
CC
One input at V
CC
- 0.6V, other inputs at V
CC
or GND
V
CC
= 2.3V to 2.7V
V
CC
= 2.7V to 3.6V
V
CC
= 2.3V to 2.7V
V
CC
= 2.7V to 3.6V
V
CC
= 3.6V
V
CC
= 3.6V
V
CC
= 3.6V
V
I
= V
CC
V
I
= GND
V
O
= V
CC
V
O
= GND
Test Conditions
Min.
1.7
2
—
—
—
—
—
—
—
—
—
Typ.
(1)
—
—
—
—
—
—
—
—
–0.7
100
0.1
Max.
—
—
0.7
0.8
±5
±5
±10
±10
–1.2
—
40
V
mV
µA
µA
µA
µA
V
Unit
V
Quiescent Power Supply Current
Variation
—
—
750
µA
NOTE:
1. Typical values are at V
CC
= 3.3V, +25°C ambient.
BUS-HOLD CHARACTERISTICS
Symbol
I
BHH
I
BHL
I
BHH
I
BHL
I
BHHO
I
BHLO
NOTES:
1. Pins with Bus-Hold are identified in the pin description.
2. Typical values are at V
CC
= 3.3V, +25°C ambient.
Parameter
(1)
Bus-Hold Input Sustain Current
Bus-Hold Input Sustain Current
Bus-Hold Input Overdrive Current
V
CC
= 3V
V
CC
= 2.3V
V
CC
= 3.6V
Test Conditions
V
I
= 2V
V
I
= 0.8V
V
I
= 1.7V
V
I
= 0.7V
V
I
= 0 to 3.6V
Min.
– 75
75
– 45
45
—
Typ.
(2)
—
—
—
—
—
Max.
—
—
—
—
±500
Unit
µA
µA
µA
4
IDT74ALVCH162268
3.3V CMOS 12-BIT TO 24-BIT REGISTERED BUS EXCHANGER
INDUSTRIAL TEMPERATURE RANGE
OUTPUT DRIVE CHARACTERISTICS (A PORT)
Symbol
V
OH
Parameter
Output HIGH Voltage
V
CC
= 2.3V
V
CC
= 2.3V
V
CC
= 2.7V
V
CC
= 3V
V
CC
= 3V
V
OL
Output LOW Voltage
V
CC
= 2.3V to 3.6V
V
CC
= 2.3V
V
CC
= 2.7V
V
CC
= 3V
I
OH
= – 24mA
I
OL
= 0.1mA
I
OL
= 6mA
I
OL
= 12mA
I
OL
= 12mA
I
OL
= 24mA
Test Conditions
(1)
V
CC
= 2.3V to 3.6V
I
OH
= – 0.1mA
I
OH
= – 6mA
I
OH
= – 12mA
Min.
V
CC
– 0.2
2
1.7
2.2
2.4
2
—
—
—
—
—
Max.
—
—
—
—
—
—
0.2
0.4
0.7
0.4
0.55
V
Unit
V
NOTE:
1. V
IH
and V
IL
must be within the min. or max. range shown in the DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE table for the appropriate V
CC
range.
T
A
= – 40°C to + 85°C.
OUTPUT DRIVE CHARACTERISTICS (B PORT)
Symbol
V
OH
Parameter
Output HIGH Voltage
V
CC
= 2.3V
V
CC
= 2.7V
V
CC
= 3V
V
OL
Output LOW Voltage
V
CC
= 2.3V to 3.6V
V
CC
= 2.3V
V
CC
= 2.7V
V
CC
= 3V
Test Conditions
(1)
V
CC
= 2.3V to 3.6V
I
OH
= – 0.1mA
I
OH
= – 4mA
I
OH
= – 6mA
I
OH
= – 4mA
I
OH
= – 8mA
I
OH
= – 6mA
I
OH
= – 12mA
I
OL
= 0.1mA
I
OL
= 4mA
I
OL
= 6mA
I
OL
= 4mA
I
OL
= 8mA
I
OL
= 6mA
I
OL
= 12mA
Min.
V
CC
– 0.2
1.9
1.7
2.2
2
2.4
2
—
—
—
—
—
—
—
Max.
—
—
—
—
—
—
—
0.2
0.4
0.55
0.4
0.6
0.55
0.8
V
Unit
V
NOTE:
1. V
IH
and V
IL
must be within the min. or max. range shown in the DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE table for the appropriate V
CC
range.
T
A
= – 40°C to + 85°C.
OPERATING CHARACTERISTICS, T
A
= 25°C
V
CC
= 2.5V ± 0.2V
Symbol
C
PD
C
PD
Parameter
Power Dissipation Capacitance Outputs enabled
Power Dissipation Capacitance Outputs disabled
Test Conditions
C
L
= 0pF, f = 10Mhz
Typical
87
80
V
CC
= 3.3V ± 0.3V
Typical
120
118
Unit
pF
5
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