– Rail-to-Rail output swing for increased noise margin
Drive Features for ALVCH16652:
– High Output Drivers: ±24mA
– Suitable for heavy loads
–
–
–
IDT74ALVCH16652
APPLICATIONS:
•
3.3V High Speed Systems
•
3.3V and lower voltage computing systems
DESCRIPTION:
This 16-bit bus transceiver and register is built using advanced dual
metal CMOS technology. The ALVCH16652 consists of D-type flip-flops
and control circuitry arranged for multiplexed transmission of data
directly from the data bus or from the internal storage registers. The
device can be used as two 8-bit transceivers or one 16-bit transceiver.
Complementary output enable (OEAB and OEBA) inputs are pro-
vided to control the transceiver functions. Select control (SAB and SBA)
inputs are provided to select whether real-time or stored data is
transferred. A low input level selects real-time data, and a high input level
selects stored data. Circuitry used for select control eliminates the typical
decoding glitch that occurs in a multiplexer during the transition between
stored and real-time data. Data on the A or B bus, or both, can be stored
in the internal D flip-flops by low-to-high transition at the appropriate clock
(CLKAB or CLKBA) inputs regardless of the levels on the select control
or output enable inputs. When SAB and SBA are in the real-time transfer
mode, it also is possible to store data without using the internal D-type
flip-flops by simultaneously enabling OEAB and OEBA. In this configu-
ration, each output reinforces its input. Thus, when all other data sources
to the two sets of bus lines are in the high-impedance state, each set of
bus lines remains at its last level configuration.
The ALVCH16652 has been designed with a ±24mA output driver.
This driver is capable of driving a moderate to heavy load while
maintaining speed performance.
The ALVCH16652 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
1
OEBA
56
2
O EBA
29
1
O EAB
1
C LKBA
1
SBA
1
CLKAB
1
SAB
1
2
O EAB
2
CLKBA
2
SBA
2
CLKAB
B REG
2
SAB
28
55
30
54
2
31
27
3
26
B REG
D
C
D
C
1
A
1
5
A REG
52
1
B
1
2
A
1
15
A REG
42
2
B
1
D
C
D
C
TO 7 OTHER C HANNELS
TO 7 OTHER C HANNELS
EXTENDED COMMERCIAL TEMPERATURE RANGE
1
c
1999 Integrated Device Technology, Inc.
OCTOBER 1999
DSC-4526/-
IDT74ALVCH16652
3.3V CMOS 16-BIT BUS TRANSCEIVER AND REGISTER
EXTENDED COMMERCIAL TEMPERATURE RANGE
PIN CONFIGURATION
1
OEAB
1
CLKAB
1
SAB
ABSOLUTE MAXIMUM RATING
Symbol
V
TERM(2)
56
55
54
53
52
51
50
49
48
47
46
45
1
OEBA
1
CLKBA
1
SBA
(1)
Unit
V
V
°C
mA
mA
mA
mA
NEW16link
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)
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
1
A
1
1
A
2
GND
1
B
1
1
B
2
V
CC
1
A
3
1
A
4
1
A
5
V
CC
1
B
3
1
B
4
1
B
5
GND
1
A
6
1
A
7
1
A
8
2
A
1
2
A
2
2
A
3
GND
1
B
6
1
B
7
1
B
8
2
B
1
2
B
2
2
B
3
44
SO56-1
SO56-2 43
SO56-3
42
41
40
39
38
37
36
35
34
33
32
31
30
29
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
2
A
4
2
A
5
2
A
6
GND
2
B
4
2
B
5
2
B
6
V
CC
2
A
7
2
A
8
V
CC
2
B
7
2
B
8
NOTE:
1. As applicable to the device type.
GND
2
SAB
2
CLKAB
2
OEAB
GND
2
SBA
2
CLKBA
2
OEBA
PIN DESCRIPTION
Pin Names
xAx
xBx
xCLKAB, xCLKBA
xSAB, xSBA
xOEAB, xOEBA
Description
Data Register A Inputs
Data Register B Outputs
Data Register B Inputs
Data Register A Outputs
Clock Pulse Inputs
Output Enable Inputs
(1)
SSOP/TSSOP/TVSOP
TOP VIEW
(1)
Output Data Source Select Inputs
NOTE:
1. These pins have “Bus-Hold.” All other pins are standard inputs,
outputs, or I/Os.
2
IDT74ALVCH16652
3.3V CMOS 16-BIT BUS TRANSCEIVER AND REGISTER
EXTENDED COMMERCIAL TEMPERATURE RANGE
FUNCTION TABLE
xOEAB
L
L
X
H
L
L
L
L
H
H
H
xOEBA
H
H
H
H
X
L
L
L
H
H
L
xCLKAB
H or L
↑
↑
↑
H or L
↑
X
X
X
H or L
H or L
(1)
Data I/O
xSAB
X
X
X
X
X
X
X
X
L
H
H
(3)
Inputs
xCLKBA
H or L
↑
H or L
↑
↑
↑
X
H or L
X
X
H or L
xSBA
X
X
X
X
X
X
L
H
X
X
H
(3)
(2)
Operation or Function
xBx
Input
Input
Isolation
Store A and B data
(3)
xAx
Input
Input
Input
Input
Unspecified
Output
Output
Output
Input
Input
Output
(3)
Unspecified
Output
Input
Input
Input
Input
Output
Output
Output
Store A, hold B
Store A in both registers
Hold A, store B
Store B in both registers
Real time B data to A bus
Stored B data to A bus
Real time A data to B bus
Stored A data to B bus
Stored A data to B bus and
stored B data to A bus
NOTES:
1. H = HIGH Voltage Level
L = LOW Voltage Level
X = Don't Care
Z = High-Impedance
↑
= LOW-to-HIGH Transition
2. The data output functions may be enabled or disabled by various signals at the xOEAB or xOEBA inputs. Data input functions are always enabled, i.e. data
at the bus pins will be stored on every LOW-to-HIGH transition on the clock inputs.
3. Select control = L: clocks can occur simultaneously.
Select control = H: clocks must be staggered to load both registers.
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.
3
IDT74ALVCH16652
3.3V CMOS 16-BIT BUS TRANSCEIVER AND REGISTER
EXTENDED COMMERCIAL TEMPERATURE RANGE
BUS
A
BUS
B
BUS
A
BUS
B
xOEAB
L
xOEBA
L
xCLKAB
X
xCLKBA
X
xSAB
X
xSBA
L
xOEAB
H
xOEBA
H
xCLKAB
X
xCLKBA
X
xSAB
L
xSBA
X
REAL-TIME TRANSFER BUS B TO A
REAL-TIME TRANSFER BUS A TO B
BUS
A
BUS
B
BUS
A
BUS
B
xOEAB xOEBA
X
H
L
X
L
H
xCLKAB
↑
xCLKBA
X
↑
↑
X
↑
xSAB
X
X
X
xSBA
X
X
X
xOEAB
H
xOEBA
L
xCLKAB
H or L
xCLKBA
H or L
xSAB
H
xSBA
X
STORAGE FROM A AND/OR B
TRANSFER STORED DATA TO A
AND/OR B
4
IDT74ALVCH16652
3.3V CMOS 16-BIT BUS TRANSCEIVER AND REGISTER
EXTENDED COMMERCIAL TEMPERATURE RANGE
BUS-HOLD CHARACTERISTICS
Symbol
I
BHH
I
BHL
I
BHH
I
BHL
I
BHHO
I
BHLO
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
NOTES:
1. Pins with Bus-hold are identified in the pin description.
2. Typical values are at V
CC
= 3.3V, +25°C ambient.
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
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