16-Bit Buffers/Line Drivers
SCCS028B - December 1987 - Revised September 2001
Data sheet acquired from Cypress Semiconductor Corporation.
Data sheet modified to remove devices not offered. CY74FCT16244T
CY74FCT162244T
CY74FCT162H244T
Copyright © 2001, Texas Instruments Incorporated
1CY74FCT16444T/2
H244T
Features
•I
off supports partial-power-down mode operation
• 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
•VCC = 5V ± 10%
CY74FCT16244T Features:
• 64 mA sink current, 32 mA source current
• Typical VOLP (ground bounce)
<1.0V at VCC = 5V, TA = 25˚C
CY74FCT162244T Features:
• Balanced output drivers: 24 mA
• Reduced system switching noise
• Typical VOLP (ground bounce)
<0.6V at VCC = 5V, TA= 25˚C
CY74FCT162H244T Features:
• Bus hold on data inputs
• Eliminates the need for external pull-up or pull-down
resistors
Functional Description
These 16-bit buffers/line drivers are designed for use in
memorydriver,clockdriver,orotherbusinterface applications,
where high-speed and low power are required. With
flow-through pinout and small shrink packaging board layout
is simplified. The three-state controls are designed to allow
4-bit, 8-bit or combined 16-bit operation.
This device is fully specified for partial-power-down
applications using Ioff. The Ioff circuitry disables the outputs,
preventing damaging current backflow through the device
when it is powered down.
The CY74FCT16244T is ideally suited for driving
high-capacitance loads and low-impedance backplanes.
The CY74FCT162244T has 24-mA balanced output drivers
with current limiting resistors in the outputs. This reduces the
need for external terminating resistors and provides for mini-
mal undershoot and reduced ground bounce. The
CY74FCT162244T is ideal for driving transmission lines.
TheCY74FCT162H244T isa 24-mAbalanced outputpart that
has “bus hold” on the data inputs. The device retains the in-
put’s last state whenever the input goes to high impedance.
This eliminates the need for pull-up/down resistors and pre-
vents floating inputs.
GND
Logic Block Diagrams CY74FCT16244T, CY74FCT162244T,
CY74FCT162H244T Pin Configuration
1
2
3
4
5
6
7
8
9
10
11
12
33
32
31
30
29
25
26
27
28
36
35
1OE
34
SSOP/TSSOP
Top View
1Y1
1Y2
1Y3
1Y4
13
14
15
16
17
18
19
20
21
22
23
24
45
44
43
42
41
37
38
39
40
48
47
46
1A1
1A2
1A3
1A4
1OE
2Y1
2Y2
2Y3
2Y4
2A1
2A2
2A3
2A4
2OE
1Y1
1Y2
1Y3
1Y4
1A1
1A2
1A3
1A4
2OE
GND
GND
VCC
2Y3
2Y4
2Y1
2Y2
2A1
2A2
2A3
2A4
VCC
GND
GND
3Y3
3Y4
3Y1
3Y2
3A1
3A2
3A3
3A4
GND
GND
VCC
4Y3
4Y4
4Y1
4Y2
4A1
4A2
4A3
4A4
VCC
GND
4OE 3OE
3Y1
3Y2
3Y3
3Y4
3A1
3A2
3A3
3A4
3OE
4Y1
4Y2
4Y3
4Y4
4A1
4A2
4A3
4A4
4OE
FCT16244–1 FCT16244–2
FCT16244–3 FCT16244–4 FCT16244–5
16244T
162244T
162H244T
CY74FCT16244T
CY74FCT162244T
CY74FCT162H244T
2
Maximum Ratings [3,4]
(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 CY74FCT162H244T these pins have “bus hold.”
2. H = HIGH Voltage Level. L = LOW Voltage Level. X = Don’t Care. Z = High Importance.
3. Operationbeyond the limits set forthmayimpairtheusefullifeofthedevice.Unlessotherwisenoted,theselimitsareovertheoperatingfree-airtemperaturerange.
4. Unused inputs must always be connected to an appropriate logic voltage level, preferably either VCC or ground.
Pin Description
Name Description
OE Three-State Output Enable Inputs (Active LOW)
A Data Inputs[1]
Y Three-State Outputs
Function Table[2]
Inputs Outputs
OE A Y
L L L
L H H
H X Z Ordering Range
Range Ambient
Temperature VCC
Industrial – 40°C to +85°C 5V ± 10%
Electrical Characteristics Over the Operating Range
Parameter Description Test Conditions Min. Typ.[5] Max. Unit
VIH Input HIGH Voltage 2.0 V
VIL Input LOW Voltage 0.8 V
VHInput Hysteresis[6] 100 mV
VIK Input Clamp Diode Voltage VCC=Min., IIN=–18 mA –0.7 –1.2 V
IIH Input HIGH Current Standard VCC=Max., VI=VCC ±1µA
Bus Hold ±100
IIL Input LOW Current Standard VCC=Max., VI=GND ±1µA
Bus Hold ±100 µA
IBBH
IBBL Bus Hold Sustain Current on Bus Hold Input[7] VCC=Min. VI=2.0V –50 µA
VI=0.8V +50
IBHHO
IBHLO Bus Hold Overdrive Current on Bus Hold Input[7] VCC=Max., VI=1.5V TBD mA
IOZH High Impedance Output Current
(Three-State Output pins) VCC=Max., VOUT=2.7V ±1µA
IOZL High Impedance Output Current
(Three-State Output pins) VCC=Max., VOUT=0.5V ±1µA
IOS Short Circuit Current[8] VCC=Max., VOUT=GND –80 –140 –200 mA
IOOutput Drive Current[8] VCC=Max., VOUT=2.5V –50 –180 mA
IOFF Power-Off Disable VCC=0V, VOUT≤4.5V[9] ±1µA
CY74FCT16244T
CY74FCT162244T
CY74FCT162H244T
3
Output Drive Characteristics for CY74FCT16244T
Parameter Description Test Conditions Min. Typ.[5] Max. Unit
VOH 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
VOL Output LOW Voltage VCC=Min., IOL=64 mA 0.2 0.55 V
Output Drive Characteristics for CY74FCT162244T, CY74FCT162H244T
Parameter Description Test Conditions Min. Typ.[5] Max. Unit
IODL Output LOW Current[8] VCC=5V, VIN=VIH or VIL, VOUT=1.5V 60 115 150 mA
IODH Output HIGH Current[8] VCC=5V, VIN=VIH or VIL, VOUT=1.5V –60 –115 –150 mA
VOH Output HIGH Voltage VCC=Min., IOH=–24 mA 2.4 3.3 V
VOL Output LOW Voltage VCC=Min., IOL=24 mA 0.3 0.55 V
Notes:
5. Typical values are at VCC=5.0V, TA = +25˚C ambient.
6. This parameter is specified but not tested.
7. Pins with bus hold are described in Pin Description.
8. 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 preferable in order to minimize internal chip heating and more accurately reflect operational values. Otherwise prolonged shorting
of a high output may raise the chip temperature well above normal and thereby cause invalid readings in other parametric tests. In any sequence of parameter
tests, IOS tests should be performed last.
9. Tested at +25˚C.
CY74FCT16244T
CY74FCT162244T
CY74FCT162H244T
4
Capacitance[6](TA = +25˚C, f = 1.0 MHz)
Parameter Description Test Conditions Typ.[5] Max. Unit
CIN Input Capacitance VIN = 0V 4.5 6.0 pF
COUT Output Capacitance VOUT = 0V 5.5 8.0 pF
Power Supply Characteristics
Parameter Description Test Conditions Typ.[5] Max. Unit
ICC Quiescent Power Supply Current VCC=Max. VIN≤0.2V,
VIN≤VCC-0.2V 5 500 µA
∆ICC Quiescent Power Supply Current
(TTL inputs HIGH) VCC=Max. VIN=3.4V[10] 0.5 1.5 mA
ICCD Dynamic Power Supply
Current[11] VCC=Max.,OneInputToggling,
50% Duty Cycle, Outputs
Open, OE=GND
VIN=VCC or
VIN=GND 60 100 µA/MHz
ICTotal Power Supply Current[12] VCC=Max., f1=10 MHz,
50% Duty Cycle, Outputs
Open, One Bit Toggling,
OE=GND
VIN=VCC or
VIN=GND 0.6 1.5 mA
VIN=3.4V or
VIN=GND 0.9 2.3 mA
VCC=Max., f1=2.5 MHz, 50%
DutyCycle,OutputsOpen,Six-
teen Bits Toggling,
OE=GND
VIN=VCC or
VIN=GND 2.4 4.5[13] mA
VIN=3.4V or
VIN=GND 6.4 16.5[13] mA
Notes:
10. Per TTL driven input (VIN = 3.4V); all other inputs at VCC or GND.
11. This parameter is not directly testable, but is derived for use in Total Power Supply calculations.
12. IC=IQUIESCENT + IINPUTS + IDYNAMIC
IC=I
CC+∆ICCDHNT+ICCD(f0/2 + f1N1)
ICC = Quiescent Current with CMOS input levels
ICC = Power Supply Current for a TTL HIGH input (VIN=3.4V)
DH= Duty Cycle for TTL inputs HIGH
NT= Number of TTL inputs at DH
ICCD = Dynamic Current caused by an input transition pair (HLH or LHL)
f0= Clock frequency for registered devices, otherwise zero
f1= Input signal frequency
N1= Number of inputs changing at f1
All currents are in milliamps and all frequencies are in megahertz.
13. Values for these conditions are examples of the ICC formula. These limits are specified but not tested.
CY74FCT16244T
CY74FCT162244T
CY74FCT162H244T
5
SSwitching Characteristics Over the Operating Range[14]
Parameter Description
CY74FCT16244T
CY74FCT162244T
CY74FCT16244AT
CY74FCT162244AT
CY74FCT162H244AT
Min. Max. Min. Max. Unit Fig. No.[15]
tPLH
tPHL Propagation Delay Data to Output 1.5 6.5 1.5 4.8 ns 1, 3
tPZH
tPZL Output Enable Time 1.5 8.0 1.5 6.2 ns 1, 7, 8
tPHZ
tPLZ Output Disable Time 1.5 7.0 1.5 5.6 ns 1, 7, 8
tSK(O) Output Skew[16] 0.5 0.5 ns —
Switching Characteristics Over the Operating Range[14] (continued)
Parameter Description
CY74FCT16244CT
CY74FCT162244CT
CY74FCT162H244CT
Min. Max. Unit Fig. No.[15]
tPLH
tPHL Propagation Delay Data to Output 1.5 4.1 ns 1, 3
tPZH
tPZL Output Enable Time 1.5 5.8 ns 1, 7, 8
tPHZ
tPLZ Output Disable Time 1.5 5.2 ns 1, 7, 8
tSK(O) Output Skew[16] 0.5 ns —
Notes:
14. Minimum limits are specified but not tested on Propagation Delays.
15. See “Parameter Measurement Information” in the General Information section.
16. Skew between any two outputs of the same package switching in the same direction. This parameter is ensured by design.
CY74FCT16244T
CY74FCT162244T
CY74FCT162H244T
6
Document #: 38-00396-C
Ordering Information CY74FCT16244
Speed
(ns) Ordering Code Package
Name Package Type Operating
Range
4.1 CY74FCT16244CTPACT Z48 48-Lead (240-Mil) TSSOP Industrial
CY74FCT16244CTPVC/PVCT O48 48-Lead (300-Mil) SSOP
4.8 CY74FCT16244ATPACT Z48 48-Lead (240-Mil) TSSOP Industrial
CY74FCT16244ATPVC/PVCT O48 48-Lead (300-Mil) SSOP
6.5 CY74FCT16244TPACT Z48 48-Lead (240-Mil) TSSOP Industrial
CY74FCT16244TPVC/PVCT O48 48-Lead (300-Mil) SSOP
Ordering Information CY74FCT162244
Speed
(ns) Ordering Code Package
Name Package Type Operating
Range
4.1 74FCT162244CTPACT Z48 48-Lead (240-Mil) TSSOP Industrial
CY74FCT162244CTPVC O48 48-Lead (300-Mil) SSOP
74FCT162244CTPVCT O48 48-Lead (300-Mil) SSOP
4.8 74FCT162244ATPACT Z48 48-Lead (240-Mil) TSSOP Industrial
CY74FCT162244ATPVC O48 48-Lead (300-Mil) SSOP
74FCT162244ATPVCT O48 48-Lead (300-Mil) SSOP
6.5 CY74FCT162244TPACT Z48 48-Lead (240-Mil) TSSOP Industrial
CY74FCT162244TPVC/PVCT O48 48-Lead (300-Mil) SSOP
Ordering Information CY74FCT162H244
Speed
(ns) Ordering Code Package
Name Package Type Operating
Range
4.1 74FCT162H244CTPVC/PVCT O48 48-Lead (300-Mil) SSOP Industrial
4.8 74FCT162H244ATPACT Z48 48-Lead (240-Mil) TSSOP Industrial
CY74FCT16244T
CY74FCT162244T
CY74FCT162H244T
7
Package Diagrams
48-Lead Shrunk Small Outline Package O48
48-Lead ThinShrunk SmallOutline Package Z48
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