16-Bit Buffers/Line Drivers
CY74FCT16240T
CY74FCT162240T
Data sheet acquired from Cypress Semiconductor Corporation.
Data sheet modified to remove devices not offered.
SCCS027B - August 1994 - Revised September 2001
Copyright © 2001, Texas Instruments Incorporated
1CY74FCT162240T
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%
CY74FCT16240T Features:
• 64 mA sink current, 32 mA source current
• Typical VOLP (ground bounce)
<1.0V at VCC = 5V, TA = 25˚C
CY74FCT162240T Features:
• Balanced output drivers: 24 mA
• Reduced system switching noise
• Typical VOLP (ground bounce)
<0.6V at VCC = 5V, TA= 25˚C
Functional Description
These 16-bit buffer/line drivers are used in memory driver,
clock driver, or other bus interface 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-, 8-, or 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 CY74FCT16240T is ideally suited for driving
high-capacitance loads and low-impedance backplanes.
The CY74FCT162240T 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
CY74FCT162240T is ideal for driving transmission lines.
GND
Logic Block Diagrams 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
FCT16240–1
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
FCT16240–2
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
3OE
4OE
FCT16240–3
3Y1
3Y2
3Y3
3Y4
3A1
3A2
3A3
3A4
3OE
FCT16240–4
4Y1
4Y2
4Y3
4Y4
4A1
4A2
4A3
4A4
4OE
FCT16240–5
CY74FCT16240T
CY74FCT162240T
2
Maximum Ratings[2, 3]
(Above which the useful life may be impaired. For user
guidelines, not tested.)
Storage Temperature ......................Com’l.–55°C to +125°C
Ambient Temperature with
Power Applied..................................Com’l.–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
(per MIL-STD-883, Method 3015) .............................>2001V
Pin Summary
Name Description
OE Three-State Output Enable Inputs (Active LOW)
A Data Inputs
Y Three-State Outputs
Function Table[1]
Inputs Outputs
OE A Y
L L H
L H L
H X Z Operating 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.[4] Max. Unit
VIH Input HIGH Voltage 2.0 V
VIL Input LOW Voltage 0.8 V
VHInput Hysteresis[5] 100 mV
VIK Input Clamp Diode Voltage VCC = Min., IIN= –18 mA –0.7 –1.2 V
IIH Input HIGH Current VCC = Max., VI= VCC ±1µA
IIH Input HIGH Current VCC = Max., VI= VCC ±1µA
IIL Input LOW Current VCC = Max., VI= GND ±1µA
IIL Input LOW Current VCC = Max., VI= GND ±1µA
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[6] VCC = Max., VOUT = GND –80 –140 –200 mA
IOOutput Drive Current[6] VCC = Max., VOUT = 2.5V –50 –180 mA
IOFF Power-Off Disable VCC = 0V, VOUT ≤4.5V[7] ±1µA
Output Drive Characteristics for CY74FCT16240T
Parameter Description Test Conditions Min. Typ.[4] 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
Notes:
1. H = HIGH Voltage Level. L = LOW Voltage Level. X = Don’t Care. Z = High Impedance.
2. Operation beyond the limits set forth may impair the useful life of the device. Unless noted, these limits are over the operating free-air temperature range.
3. Unused inputs must always be connected to an appropriate logic voltage level, preferably either VCC or ground.
4. Typical values are at VCC=5.0V, TA= +25˚C ambient.
5. This parameter is specified but not tested.
6. 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.
7. Tested at +25˚C.
CY74FCT16240T
CY74FCT162240T
3
Output Drive Characteristics for CY74FCT162240T
Parameter Description Test Conditions Min. Typ.[4] Max. Unit
IODL Output LOW Current[6] VCC = 5V, VIN = VIH or VIL,VOUT = 1.5V 60 115 150 mA
IODH Output HIGH Current[6] 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
Capacitance[5] (TA = +25˚C, f = 1.0 MHz)
Parameter Description Test Conditions Typ.[4] 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.[4] Max. Unit
ICC QuiescentPowerSupplyCurrent VCC=Max. VIN≤0.2V,
VIN≥VCC–0.2V 5 500 µA
∆ICC QuiescentPowerSupplyCurrent
(TTL inputs HIGH) VCC=Max. VIN=3.4V[8] 0.5 1.5 mA
ICCD Dynamic Power Supply
Current[9] VCC=Max., One Input Tog-
gling, 50% Duty Cycle, Out-
puts Open, OE=GND
VIN=VCC or
VIN=GND 60 100 µA/MHz
ICTotal Power Supply Current[10] 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%
Duty Cycle, Outputs Open,
Sixteen Bits Toggling,
OE=GND
VIN=VCC or
VIN=GND 2.4 4.5[11] mA
VIN=3.4V or
VIN=GND 6.4 16.5[11] mA
Notes:
8. Per TTL driven input (VIN=3.4V); all other inputs at VCC or GND.
9. This parameter is not directly testable, but is derived for use in Total Power Supply calculations.
10. IC=I
QUIESCENT + 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.
11. Values for these conditions are examples of the ICC formula. These limits are specified but not tested.
CY74FCT16240T
CY74FCT162240T
4
Switching Characteristics Over the Operating Range[12]
Document #: 38-00395-C
CY74FCT16240AT CY74FCT162240CT Fig.
No.[13]
Parameter Description Min. Max. Min. Max. Unit
tPLH
tPHL Propagation Delay Data to Output 1.5 4.8 1.5 4.3 ns 1, 2
tPZH
tPZL Output Enable Time 1.5 6.2 1.5 5.8 ns 1, 7, 8
tPHZ
tPLZ Output Disable Time 1.5 5.6 1.5 5.2 ns 1, 7, 8
tSK(O) Output Skew[14] 0.5 0.5 ns —
Note:
12. Minimum limits are specified but not tested on Propagation Delays.
13. See “Parameter Measurement Information” in the General Information section.
14. Skew between any two outputs of the same package switching in the same direction. This parameter is ensured by design.
Ordering Information CY74FCT16240
Speed
(ns) Ordering Code Package
Name Package Type Operating
Range
4.8 CY74FCT16240ATPVC/PVCT O48 48-Lead (300-Mil) SSOP Industrial
Ordering Information CY74FCT162240
Speed
(ns) Ordering Code Package
Name Package Type Operating
Range
4.3 74FCT162240CTPACT Z48 48-Lead (240-Mil) TSSOP Industrial
CY74FCT162240CTPVC O48 48-Lead (300-Mil) SSOP
74FCT162240CTPVCT O48 48-Lead (300-Mil) SSOP
CY74FCT16240T
CY74FCT162240T
5
Package Diagrams
48-Lead Shrunk Small Outline Package O48
CY74FCT16240T
CY74FCT162240T
6
Package Diagrams
48-Lead Thin Shrunk Small Outline Package
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