HM-6642 Intersil Corporation, HM-6642 Datasheet - Page 2

• Manufacturer Part Number: HM-6642
• Description: 512x8 Cmos Prom
• Manufacturer: Intersil Corporation

Functional Diagram
A8
A7
A6
A5
A4
A3
A2
A1
A0
E
G1
G2
G3
REGISTER
REGISTER
ADDRESS
ADDRESS
LATCHED
LATCHED
A
A
A
A
6
6
3
3
2
DECODER
GATED
ROW
Q0
Q1
64
D
8
Q2
HM-6642/883
8
8-BIT DATA LATCH
GATED COLUMN
Q3
8
DECODER
MATRIX
64 x 64
8
8
Q4
8
8
Q5
8
Q6
ALL LINES POSITIVE LOGIC - ACTIVE HIGH
THREE STATE BUFFERS:
DATA LATCHES:
ADDRESS LATCHES AND GATED DECODERS:
P SHOULD BE HARDWIRED TO GND EXCEPT
Q7
A HIGH
L HIGH
Q LATCHES ON RISING EDGE OF E
LATCH ON FALLING EDGE OF E
GATE ON FALLING EDGE OF E
DURING PROGRAMMING
Q = D
OUTPUT ACTIVE