IDT74ALVCH16276
3.3V CMOS 12-BIT SYNCHRONOUS BUS EXCHANGER
EXTENDED COMMERCIAL TEMPERATURE RANGE
3.3V CMOS 12-BIT
SYNCHRONOUS BUS
EXCHANGER WITH
BUS-HOLD
FEATURES:
0.5 MICRON CMOS Technology
Typical t
SK(0)
(Output Skew) < 250ps
ESD > 2000V per MIL-STD-883, Method 3015;
> 200V using machine model (C = 200pF, R = 0)
– 0.635mm pitch SSOP, 0.50mm pitch TSSOP,
and 0.40mm pitch TVSOP packages
– Extended commercial range of – 40°C to + 85°C
– 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)
– Rail-to-Rail output swing for increased noise margin
Drive Features for ALVCH16276:
– High Output Drivers: ±24mA
– Suitable for heavy loads
–
–
–
IDT74ALVCH16276
DESCRIPTION:
This 12-bit synchronous bus exchanger is built using dual metal
CMOS technology. The ALVCH16276 device is a high-speed, bidirec-
tional, 12-bit, registered, bus multiplexer for use in synchronous memory
interleaving applications. All registers have a common clock and use a
clock enable (CExxx) on each data register to control data sequencing.
The output enables and mux select (OEA, OEB and SEL) are also under
synchronous control allowing direction changes to be edge triggered
events.
The ALVCH16276 has three 12-bit ports. Data may be transferred
between the A port and either/both of the B ports. The clock enable
(CE1B, CE2B, CEA1B and CEA2B) inputs control data storage. Both B
ports have a common output enable (OEB) to aid in synchronously
loading the B registers from the B port.
The ALVCH16276 has been designed with a ±24mA output driver.
This driver is capable of driving a moderate to heavy load while
maintaining speed performance.
The ALVCH16276 has “bus-hold” which retains the inputs’ last state
whenever the input goes to a high impedance. This prevents floating
inputs and eliminates the need for pull-up/down resistors.
APPLICATIONS:
•
3.3V High Speed Systems
•
3.3V and lower voltage computing systems
Functional Block Diagram
1
29
CEA1B
CLK
A-1B
REGISTER
Q
D
CE
12
CE
1
B
1:12
12
CE1B
56
SEL
OEB
OEA
A
1:12
28
30
27
CONTROL
REGISTER
M
U
X
1
12
1B-A
REGISTER
Q
D
12
12
0
CE2B
55
12
12
CE 2B-A
REGISTER
D
Q
CE A-2B
REGISTER
D
Q
12
CEA2B
2
2
B
1:12
12
EXTENDED COMMERCIAL TEMPERATURE RANGE
1
c
1999 Integrated Device Technology, Inc.
FEBRUARY 1999
DSC-4213/1
IDT74ALVCH16276
3.3V CMOS 12-BIT SYNCHRONOUS BUS EXCHANGER
EXTENDED COMMERCIAL TEMPERATURE RANGE
PIN CONFIGURATION
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
56
55
54
53
52
51
50
49
48
47
46
45
44
SO56-1
SO56-2 43
SO56-3
42
41
40
39
38
37
36
35
34
33
32
31
30
29
ABSOLUTE MAXIMUM RATING
Symbol
V
TERM(2)
CE1B
CE2B
2
B
4
(1)
Unit
V
V
°C
mA
mA
mA
mA
NEW16link
CEA1B
CEA2B
2
B
3
V
TERM(3)
T
STG
I
OUT
I
IK
I
OK
I
CC
I
SS
Description
Terminal Voltage
with Respect to GND
Terminal Voltage
with Respect to GND
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
Max.
– 0.5 to + 4.6
– 0.5 to
V
CC
+ 0.5
– 65 to + 150
– 50 to + 50
± 50
– 50
±100
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
o
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
NEW16link
GND
1
B
9
1
B
8
1
B
7
V
CC
1
B
6
1
B
5
NOTE:
1. As applicable to the device type.
GND
1
B
3
GND
1
B
4
OEA
SEL
OEB
CLK
SSOP/
TSSOP/TVSOP
TOP VIEW
c 1998 Integrated Device Technology, Inc.
2
DSC-123456
IDT74ALVCH16276
3.3V CMOS 12-BIT SYNCHRONOUS BUS EXCHANGER
EXTENDED COMMERCIAL TEMPERATURE RANGE
PIN DESCRIPTION
Pin Names
Ax
(1:12)
1
Bx
(1:12)
2
Bx
(1:12)
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)
Bidirectional Data Port 1B. Usually connected to the even path or even bank of memory.
(1)
Bidirectional Data Port 2B. Usually connected to the odd path or odd bank of memory.
(1)
Clock Input
Clock Enable Input for the A-1B Register. If CEA1B is LOW during the rising edge of CLK, data will be clocked into register A-1B
(Active LOW).
Clock Enable Input for the A-2B Register. If CEA2B is LOW during the rising edge of CLK, data will be clocked into register A-2B
(Active LOW).
Clock Enable Input for the 1B-A Register. If CE1B is LOW during the rising edge of CLK, data will be clocked
into register 1B-A (Active LOW).
Clock Enable Input for the 2B-A Register. If CE2B 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.
Synchronous Output Enable for A Port (Active LOW).
Synchronous Output Enable for 1B Port and 2B Port (Active LOW).
CLK
CEA1B
CEA2B
CE1B
CE2B
SEL
OEA
OEB
NOTE:
1. These pins have “Bus-Hold.” All other pins are standard inputs, outputs, or I/Os.
FUNCTION TABLES
(1)
Inputs
1
Bx
2
Bx
Output
CE2B
X
X
X
L
L
H
X
OEA
L
L
L
L
L
L
H
CLK
—
—
—
—
—
—
—
Outputs
OEB
L
L
L
L
L
L
L
H
L
CLK
—
—
—
—
—
—
—
—
—
1
Bx
2
Bx
H
L
X
X
X
X
X
X
X
X
H
L
X
X
SEL
H
H
H
L
L
L
X
CE1B
L
L
H
X
X
X
X
Ax
H
L
A
O
(2)
H
L
A
O
(2)
Z
Inputs
Ax
H
L
H
L
H
L
X
X
X
CEA1B
L
L
L
L
H
H
H
X
X
CEA2B
L
L
H
H
L
L
H
X
X
H
L
H
L
B
O
B
O
H
L
B
O
(2)
(2)
(2)
(2)
B
O
H
L
B
O
Z
(2)
B
O
(2)
Z
Active
Active
NOTES:
1. H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
Z = High-Impedance
2. Output level before the indicated steady-state input conditions were
established.
3
IDT74ALVCH16276
3.3V CMOS 12-BIT SYNCHRONOUS BUS EXCHANGER
EXTENDED COMMERCIAL TEMPERATURE RANGE
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Operating Condition: TA = – 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
Quiescent Power Supply
Current Variation
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
Test Conditions
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
Min.
1.7
2
—
—
—
—
—
—
—
—
—
Typ.
(1)
—
—
—
—
—
—
—
—
– 0.7
100
0.1
Max.
—
—
0.7
0.8
±5
±5
± 10
± 10
– 1.2
—
40
µA
µA
V
mV
µA
µA
V
Unit
V
—
—
750
µA
NEW16link
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.
NEW16link
Parameter
(1)
Bus-Hold Input Sustain Current
Bus-Hold Input Sustain Current
Bus-Hold Input Overdrive Current
V
CC
= 3.0V
V
CC
= 2.3V
V
CC
= 3.6V
Test Conditions
V
I
= 2.0V
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
IDT74ALVCH16276
3.3V CMOS 12-BIT SYNCHRONOUS BUS EXCHANGER
EXTENDED COMMERCIAL TEMPERATURE RANGE
OUTPUT DRIVE CHARACTERISTICS
Symbol
V
OH
Parameter
Output HIGH Voltage
V
CC
Test Conditions
(1)
= 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
I
OH
= – 24mA
I
OL
= 0.1mA
I
OL
= 6mA
I
OL
= 12mA
V
CC
= 2.7V
V
CC
= 3.0V
I
OL
= 12mA
I
OL
= 24mA
2
—
—
—
—
—
Max.
—
—
—
—
—
—
0.2
0.4
0.7
0.4
0.55
NEW16link
Unit
V
V
CC
= 2.3V
V
CC
= 2.3V
V
CC
= 2.7V
V
CC
= 3.0V
V
CC
= 3.0V
V
OL
Output LOW Voltage
V
CC
= 2.3V to 3.6V
V
CC
= 2.3V
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
o
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
55
46
V
CC
= 3.3V ± 0.3V
Typical
59
49
Unit
pF
pF
5
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