Philips Semiconductors

Product specification

74F189A

64-bit TTL bipolar RAM, inverting (3-State)

2

1990 Feb 23

853–1309 98908

FEATURES

DESCRIPTION

The 74F189A is a high speed, 64-bit RAM organized as a 16-word

by 4-bit array. Address inputs are buffered to minimize loading and

are fully decoded on chip. The outputs are in high impedance state

whenever the chip enable (CE) is high. The outputs are active only

in the READ mode (WE = high) and the output data is the

complement of the stored data.

TYPE

TYPICAL

ACCESS

TIME

TYPICAL

SUPPLY

CURRENT

( TOTAL)

74F189A

5.0ns

55mA

ORDERING INFORMATION

ORDER CODE

DESCRIPTION

COMMERCIAL RANGE

DRAWING NUMBER

16-pin plastic Dual In-line Package

N74F189AN

SOT38-4

16-pin plastic Small Outline (150mil)

N74F189AD

SOT109-1

INPUT AND OUTPUT LOADING AND FAN OUT TABLE

PINS

DESCRIPTION

74F (U.L.)

HIGH/LOW

LOAD VALUE

HIGH/LOW

D0 – D3

Data inputs

1.0/1.0

20

µA/0.6mA

A0 – A3

Address inputs

1.0/1.0

20

µA/0.6mA

CE

Chip enable input (active low)

1.0/2.0

20

µA/1.2mA

WE

Write enable input (active low)

1.0/2.0

20

µA/1.2mA

Q0 – Q3

Data outputs

150/40

3mA/24mA

NOTE: One (1.0) FAST unit load is defined as: 20

µA in the high state and 0.6mA in the low state.

PIN CONFIGURATION

16

15

14

13

12

11

10

7

6

5

4

3

2

1

D0

D3

D2

Q2

Q3

A1

A2

A0

CE

Q1

WE

D1

GND

9

8

Q0

VCC

A3

SF00299

LOGIC SYMBOL

D0

D2 D3

D1

Q0 Q1 Q2 Q3

57

9

11

610 12

VCC = pin 16

GND = pin 8

4

A0

A1

A2

A3

CE

WE

1

15

14

13

2

3

SF00300