HM-6551 Intersil Corporation, HM-6551 Datasheet - Page 2

• Manufacturer Part Number: HM-6551
• Description: 256 X 4 Cmos Ram
• Manufacturer: Intersil Corporation

Functional Diagram
NOTES:
1. Select Latch: L Low
2. Address Latches And Gated Decoders: Latch on falling edge of E and gate on falling edge of E.
3. All lines positive logic-active high.
4. Three-State Buffers: A high
5. Data Latches: L High
D0
D1
D2
D3
S2
S1
A0
A1
A5
A6
A7
W
E
Q = D and Q latches on rising edge of L.
Q = D and Q latches on falling edge of L.
REGISTER
ADDRESS
LATCHED
A
A
A
A
D
output active.
SELECT
LATCH
L
A
A
Q
5
5
DECODER
GATED
ROW
HM-6551/883
32
6-102
LATCHED ADDRESS
A2
GATED COLUMN
8
A
AND DATA I/O
DECODER
REGISTER
3
MATRIX
32 x 32
8
A3
A
8
3
A4
8
D
D
D
D
LATCHES
OUTPUT
DATA
L
Q
Q
Q
Q
A
A
A
A
Q0
Q1
Q2
Q3