Texas Instruments CY74FCT16244TPVCT, CY74FCT16244TPVC, CY74FCT16244TPACT, CY74FCT16244TPAC, CY74FCT16244ETPVCT Datasheet

16-Bit Buffers/Line Drivers

SCCS028 - December 1987 - Revised March 2000

Data sheet acquired from Cypress Semiconductor Corporation.
Data sheet modified to remove devices not offered.

CY74FCT16244T

CY74FCT162244T

CY74FCT162H244T

Copyright © 2000, Texas Instruments Incorporated

1CY74FCT16444T/2
H244T

Features

• FCT-E speed at 3.2 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%

CY74FCT16244T Features:

• 64 mA sink current, 32 mA source current

• Typical V

OLP

(ground bounce)

<1.0V at VCC = 5V, TA = 25˚C

CY74FCT162244T Features:

• Balanced output drivers: 24 mA

• Reduced system switching noise

• Typical V

OLP

(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
memory driver,clockdriver,or otherbusinterfaceapplications,
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. The outputs are de­signed with a power-off disable feature to allow for live
insertion of boards.

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 mini­mal undershoot and reduced ground bounce. The
CY74FCT162244T is ideal for driving transmission lines.

TheCY74FCT162H244T isa 24-mAbalanced 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.

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

1

OE

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

1

OE

2Y1

2Y2

2Y3

2Y4

2A1

2A2

2A3

2A4

2

OE

1Y1
1Y2

1Y3
1Y4

1A1
1A2

1A3
1A4

2

OE

GND

GND

V

CC

2Y3
2Y4

2Y1
2Y2

2A1
2A2

2A3
2A4

V

CC

GND

GND

3Y3
3Y4

3Y1
3Y2

3A1
3A2

3A3
3A4

GND

GND

V

CC

4Y3
4Y4

4Y1
4Y2

4A1
4A2

4A3
4A4

V

CC

GND

4

OE

3

OE

3Y1

3Y2

3Y3

3Y4

3A1

3A2

3A3

3A4

3

OE

4Y1

4Y2

4Y3

4Y4

4A1

4A2

4A3

4A4

4

OE

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. Operationbeyondthe limitssetforthmay impairtheuseful life ofthe device. Unlessotherwise noted, these limits areover the operatingfree-air temperature range.

4. Unused inputs must always be connected to an appropriate logic voltage level, preferably either V

CC

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 V

CC

Industrial – 40°C to +85°C 5V ± 10%

Electrical Characteristics Over the Operating Range

Parameter Description Test Conditions Min. Typ.

[5]

Max. Unit

V

IH

Input HIGH Voltage 2.0 V

V

IL

Input LOW Voltage 0.8 V

V

H

Input Hysteresis

[6]

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

[7]

VCC=Min. VI=2.0V –50 µA

VI=0.8V +50

I

BHHO

I

BHLO

Bus Hold Overdrive Current on Bus Hold Input

[7]

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

[8]

VCC=Max., V

OUT

=GND –80 –140 –200 mA

I

O

Output Drive Current

[8]

VCC=Max., V

OUT

=2.5V –50 –180 mA

I

OFF

Power-Off Disable VCC=0V, V

OUT

≤4.5V

[9]

±1 µA

CY74FCT16244T

CY74FCT162244T

CY74FCT162H244T

3

Output Drive Characteristics for CY74FCT16244T

Parameter Description Test Conditions Min. Typ.

[5]

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 CY74FCT162244T, CY74FCT162H244T

Parameter Description Test Conditions Min. Typ.

[5]

Max. Unit

I

ODL

Output LOW Current

[8]

VCC=5V, VIN=VIH or VIL, V

OUT

=1.5V 60 115 150 mA

I

ODH

Output HIGH Current

[8]

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

Notes:

5. Typical values are at V

CC

=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 oneoutput shouldbe shorted at atime. Durationof short should not exceed one second. Theuse ofhigh-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
ofa high output mayraisethe chip temperature well abovenormal and therebycause invalidreadings in other parametrictests.Inanysequenceof parameter
tests, I

OS

tests should be performed last.

9. Tested at +25˚C.