Philips HEF4505BP, HEF4505BDB, HEF4505BD Datasheet

DATA SH EET

Product specification
File under Integrated Circuits, IC04

January 1995

INTEGRATED CIRCUITS

HEF4505B
LSI

64-bit, 1-bit per word random
access read/write memory

For a complete data sheet, please also download:

•The IC04 LOCMOS HE4000B Logic
Family Specifications HEF, HEC

•The IC04 LOCMOS HE4000B Logic
Package Outlines/Information HEF, HEC

January 1995 2

Philips Semiconductors Product specification

64-bit, 1-bit per word random access
read/write memory

HEF4505B

LSI

DESCRIPTION

The HEF4505B is a 64-bit, 1-bit per word, fully decoded
and completely static, random access memory. The
memory is strobed for reading or writing only when the
strobe input (ST), chip enable inputs (CE1and CE2) are
HIGH simultaneously. The output data is available at the
data output (D

OUT

) only when the memory is strobed, the
read/write input (R/W) is HIGH and after the read access
time has passed. Note that the three-state output is initially
disabled and always goes to the LOW state before data is
valid. The output is disabled in the high-impedance
OFF-state, when the memory is not strobed or R/

W is
LOW. R/W may remain HIGH during a read cycle or LOW
during a write cycle. The output data has the same polarity
as the input data.

HEF4505BP(N): 14-lead DIL; plastic

(SOT27-1)

HEF4505BD(F): 14-lead DIL; ceramic (cerdip)

(SOT73)

( ): Package Designator North America

Fig.1 Pinning diagram.

PINNING

FUNCTION TABLE

Note

1. H = HIGH state (the more positive voltage)

L = LOW state (the less positive voltage)
Z = high-impedance OFF-state

A

0

to A

5

address inputs

CE

1

,CE

2

chip enable inputs

R/

W read/write input
ST strobe input
D

IN

data input

D

OUT

data output

ST, CE

1

,CE2R/WD

OUT

MODE

L L Z disabled

H L Z write

L H Z disabled

H H equal to memory data read

SUPPLY VOLTAGE

Note

1. Minimum standby voltage for data retention is 3 V.

FAMILY DATA, I

DD

LIMITS category LSI

See Family Specifications

RATING OPERATING

−0,5 to +15 4,5 to 15 V

January 1995 3

Philips Semiconductors Product specification

64-bit, 1-bit per word random access

read/write memory

HEF4505B

LSI

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Fig.2 Functional diagram.