Texas Instruments CY74FCT16952ETPVCT, CY74FCT16952ETPVC, CY74FCT16952CTPACT, CY74FCT16952CTPAC, CY74FCT16952ATPVCT Datasheet
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16-Bit Registered Transceivers
CY74FCT16952T
CY74FCT162952T
CY74FCT162H952T
Data sheet acquired from Cypress Semiconductor Corporation.
Data sheet modified to remove devices not offered.
SCCS065A - August 1994 - Revised March 2000
Copyright © 2000, Texas Instruments Incorporated
1CY74FCT162H952
T
Features
• FCT-E speed at 3.7 ns
• Power-off disable outputs permits live insertion
• Edge-rate control circuitry for significantly improved
noise characteristics
• Typical output skew < 250 ps
• ESD > 2000V
• TSSOP (19.6-mil pitch) and SSOP (25-mil pitch)
packages
• Industrial temperature range of –40˚C to +85˚C
• V
CC
= 5V ± 10%
CY74FCT16952T Features:
• 64 mA sink current, 32 mA source current
• Typical V
OLP
(ground bounce) <1.0V at
VCC = 5V, TA = 25˚C
CY74FCT162952T Features:
• Balanced 24 mA output drivers
• Reduced system switching noise
• Typical V
OLP
(ground bounce) <0.6V at
VCC = 5V, TA= 25˚C
CY74FCT162H952T Features:
• Bus hold retains last active state
• Eliminates the need for external pull-up or pull-down
resistors
Functional Description
These 16-bit registered transceivers are high-speed,
low-powerdevices.16-bit operation is achievedby connecting
the control lines of the two 8-bit registered transceivers
together. For data flow from bus A-to-B,
CEAB must be LOW
to allow data to be stored when CLKAB transitions from
LOW-to-HIGH. The stored data will be present on the output
when
OEAB is LOW.Control of data from B-to-A is similar and
is controlled by using the
CEBA, CLKBA, and OEBA inputs.
The output buffers are designed with a power-off disable
feature to allow for live insertion of boards.
The CY74FCT16952T is ideally suited for driving
high-capacitance loads and low-impedance backplanes.
The CY74FCT162952T has 24-mA balanced output drivers
with current-limiting resistors in the outputs. This reduces the
need for external terminating resistors and provides for
minimal undershoot and reduced ground bounce. The
CY74FCT162952T is ideal for driving transmission lines.
TheCY74FCT162H952T is a 24-mA balanced output part that
has “bus hold” on the data inputs. The device retains the
input’s last state whenever the input goes to high impedance.
This eliminates the need for pull-up/down resistors and
prevents floating inputs.
LogicBlockDiagrams
Pin Configuration
1
OEAB
SSOP/TSSOP
Top View
1
CLKBA
1B1
1B2
GND
V
CC
GND
GND
FCT16952–1
1B1
TO 7 OTHER CHANNELS
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
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
1
CEBA
1
OEAB
1
CEAB
1
CLKAB
1
OEBA
1A1
D
C
CE
D
C
CE
1
CEAB
1
CLKAB
GND
1A1
1A2
1A3
1A4
GND
2A1
2A2
2A3
2A4
V
CC
1A5
1A6
1A7
1A8
GND
2A5
2A6
2A7
2A8
2
CLKAB
GND
2
OEAB
2
CEAB
V
CC
1
OEBA
1
CEBA
1
CLKBA
GND
2
CLKBA
2
OEBA
2
CEBA
1B3
1B6
1B7
1B8
1B4
1B5
2B1
2B3
2B4
2B2
2B5
2B6
2B7
2B8
V
CC
2
CLKBA
2
B
1
2
OEAB
2
CEAB
2
CLKAB
2
OEBA
2A1
D
C
CE
D
C
CE
2
CEBA
FCT16952–2
FCT16952–3
TO 7 OTHER CHANNELS
CY74FCT16952T
CY74FCT162952T
CY74FCT162H952T
2
Maximum Ratings
[5, 6]
(Above which the useful life may be impaired. For user
guidelines, not tested.)
Storage Temperature ................................. –55°C to +125°C
Ambient Temperature with
Power Applied.............................................–55°C to +125°C
DC Input Voltage ........................................... –0.5V to +7.0V
DC Output Voltage......................................... –0.5V to +7.0V
DC Output Current
(Maximum Sink Current/Pin) ........................–60 to +120 mA
Power Dissipation..........................................................1.0W
Static Discharge Voltage............................................>2001V
(per MIL-STD-883, Method 3015)
Notes:
1. On the CY74FCT162H952T these pins have bus hold.
2. A-to-B data flow is shown: B-to-A data flow is similar but uses,
CEBA, CLKBA, and OEBA.
3. H = HIGH Voltage Level.
L = LOW Voltage Level.
X = Don’t Care.
= LOW-to-HIGH Transition.
Z = HIGH Impedance.
4. Level of B before the indicated steady-state input conditions were established.
5. Operationbeyond thelimits setforth mayimpairthe usefullife ofthe device.Unlessotherwise noted,these limitsare overthe operatingfree-air temperaturerange.
6. Unused inputs must always be connected to an appropriate logic voltage level, preferably either V
CC
or ground.
Pin Description
Name Description
OEAB A-to-B Output Enable Input (Active LOW)
OEBA B-to-A Output Enable Input (Active LOW)
CEAB A-to-B Clock Enable Input (Active LOW)
CEBA B-to-A Clock Enable Input (Active LOW)
CLKAB A-to-B Clock Input
CLKBA B-to-A Clock Input
A A-to-B Data Inputs or B-to-A Three-State
Outputs
[1]
B B-to-A Data Inputs or A-to-B Three-State
Outputs
[1]
Function Table
[2, 3]
For A-to-B (Symmetric with B-to-A)
Inputs Outputs
CEAB CLKAB OEAB A B
H X L X B
[4]
X L L X B
[4]
L L L L
L L H H
X X H X Z
Operating Range
Range
Ambient
Temperature V
CC
Industrial –40°C to +85°C 5V ± 10%
CY74FCT16952T
CY74FCT162952T
CY74FCT162H952T
3
Note:
7. Typical values are at V
CC
= 5.0V, TA= +25˚C ambient.
8. This parameter is specified but not tested.
9. Pins with bus hold are described in the Pin Description.
10. Not more than one output should be shorted at a time. Duration of short should not exceed one second. The use of high-speed test apparatus and/or sample
and hold techniques are preferablein order to minimize internal chip heating and more accurately reflect operational values. Otherwise prolonged shorting of a
high output mayraise the chip temperaturewell above normal and therebycause invalid readings in otherparametric tests. In any sequenceof parameter tests,
I
OS
tests should be performed last.
11. Tested at +25˚C.
Electrical Characteristics Over the Operating Range
Parameter Description Test Conditions Min. Typ.
[7]
Max. Unit
V
IH
Input HIGH Voltage 2.0 V
V
IL
Input LOW Voltage 0.8 V
V
H
Input Hysteresis
[8]
100 mV
V
IK
Input Clamp Diode Voltage VCC=Min., IIN= –18 mA –0.7 –1.2 V
I
IH
Input HIGH Current Standard VCC=Max., VI=V
CC
±1 µA
Bus Hold ±100
I
IL
Input LOW Current Standard VCC=Max., VI=GND ±1 µA
Bus Hold ±100 µA
I
BBH
I
BBL
Bus Hold Sustain Current on Bus Hold Input
[9]
VCC=Min. VI=2.0V –50 µA
VI=0.8V +50 µA
I
BHHO
I
BHLO
BusHoldOverdriveCurrent on Bus Hold Input
[9]
VCC=Max., VI=1.5V TBD mA
I
OZH
High Impedance Output Current (Three-State
Output pins)
VCC=Max., V
OUT
=2.7V ±1 µA
I
OZL
High Impedance Output Current (Three-State
Output pins)
VCC=Max., V
OUT
=0.5V ±1 µA
I
OS
Short Circuit Current
[10]
VCC=Max., V
OUT
=GND –80 –140 –200 mA
I
O
Output Drive Current
[10]
VCC=Max., V
OUT
=2.5V –50 –180 mA
I
OFF
Power-Off Disable VCC=0V, V
OUT
≤4.5V
[11]
±1 µA
Output Drive Characteristics for CY74FCT16952T
Parameter Description Test Conditions Min. Typ.
[7]
Max. Unit
V
OH
Output HIGH Voltage VCC=Min., IOH= –3 mA 2.5 3.5 V
VCC=Min., IOH= –15 mA 2.4 3.5 V
VCC=Min., IOH= –32 mA 2.0 3.0 V
V
OL
Output LOW Voltage VCC=Min., IOL=64 mA 0.2 0.55 V
Output Drive Characteristics for CY74FCT162952T, CY74FCT162H952T
Parameter Description Test Conditions Min. Typ.
[7]
Max. Unit
I
ODL
Output LOW Current
[10]
VCC=5V, VIN=VIH or VIL, V
OUT
=1.5V 60 115 150 mA
I
ODH
Output HIGH Current
[10]
VCC=5V, VIN=VIH or VIL, V
OUT
=1.5V –60 –115 –150 mA
V
OH
Output HIGH Voltage VCC=Min., IOH= –24 mA 2.4 3.3 V
V
OL
Output LOW Voltage VCC=Min., IOL=24 mA 0.3 0.55 V
Capacitance
[8]
(TA = +25˚C, f = 1.0 MHz)
Parameter Description Test Conditions Typ.
[7]
Max. Unit
C
IN
Input Capacitance VIN = 0V 4.5 6.0 pF
C
OUT
Output Capacitance V
OUT
= 0V 5.5 8.0 pF
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