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National Semiconductor Electronic Components Datasheet


74F189

64-Bit Random Access Memory with TRI-STATEE Outputs



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74F189 pdf
August 1995
54F 74F189 64-Bit Random Access
Memory with TRI-STATE Outputs
General Description
The ’F189 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 TRI-
STATE and are in the high impedance state whenever the
Chip Select (CS) input is HIGH The outputs are active only
in the Read mode and the output data is the complement of
the stored data
Features
Y TRI-STATE outputs for data bus applications
Y Buffered inputs minimize loading
Y Address decoding on-chip
Y Diode clamped inputs minimize ringing
Y Available in SOIC (300 mil only)
Commercial
74F189PC
74F189SC (Note 1)
74F189SJ (Note 1)
Military
54F189DL (Note 2)
54F189FL (Note 2)
54F189LL (Note 2)
Package
Number
N16E
J16A
M16A
M16D
W16A
E20A
Package Description
16-Lead (0 300 Wide) Molded Dual-In-Line
16-Lead Ceramic Dual-In-Line
16-Lead (0 150 Wide) Molded Small Outline JEDEC
16-Lead (0 300 Wide) Molded Small Outline EIAJ
16-Lead Cerpack
20-Lead Ceramic Leadless Chip Carrier Type C
Note 1 Devices also available in 13 reel Use suffix e SCX and SJX
Note 2 Military grade device with environmental and burn-in processing Use suffix e DLQB FLQB and LLQB
Logic Symbols
Connection Diagrams
Pin Assignment
for DIP SOIC and Flatpak
Pin Assignment
for LCC
IEEE IEC
TL F 9493–1
TL F 9493 – 2
TL F 9493 – 3
TL F 9493–4
TRI-STATE is a registered trademark of National Semiconductor Corporation
C1995 National Semiconductor Corporation TL F 9493
RRD-B30M105 Printed in U S A



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74F189 pdf
Unit Loading Fan Out
Pin Names
A0 – A3
CS
WE
D0 – D3
O0 – O3
Description
Address Inputs
Chip Select Input (Active LOW)
Write Enable Input (Active LOW)
Data Inputs
Inverted Data Outputs
UL
HIGH LOW
10 10
10 10
10 10
10 10
150 40 (33 3)
54F 74F
Input IIH IIL
Output IOH IOL
20 mA b0 6 mA
20 mA b1 2 mA
20 mA b0 6 mA
20 mA b0 6 mA
b3 0 mA 24 mA (20 mA)
Function Table
Inputs
Operation
CS WE
Condition of Outputs
LL
LH
HX
Write
Read
Inhibit
High Impedance
Complement of Stored Data
High Impedance
H e HIGH Voltage Level
L e LOW Voltage Level
X e Immaterial
Block Diagram
TL F 9493 – 5
2



Part Number 74F189
Description 64-Bit Random Access Memory with TRI-STATEE Outputs
Maker National - National
Total Page 8 Pages
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