Philips PM2519 - PCD8571 128 x 8-BIT STATIC RAM

10-12
PCD8571 128 x 8-BIT STATIC RAM
General description
The PCD8571 is a low-power 1024-bit static CMOS/RAM, organized as 128 words of 8 bits each.
Data and address are transferred serially via a two-line bidirectional bus (12c), Automatic word address
incrementing in read/write modes minimizes bus traffic. Three hardware address pins AO, A1 and A2 identify
when several devices are connected on the bus, which allows the use of up to 8 RAMs without additional
hardware,
WORD
PCO8571 ADDRESS: ROW MEMORY
REGISTER SELECT CELL
1[A0 i ARRAY
At
COLUMN
126 SELECT
BUS CONTROL
N
wo AZ
yyy
MULTIPLEXER
a
SCL
INPUT
river |_|
SHIFT RIW
REGISTER CONTROL
4
ritest be
ST4464
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Pinning diagram
PINNING
1to3 AO to A2 Address inputs
4 Vss Negative supply
5 SDA Seriai data line 2
6 SCL Serial clock tine f !°C bus
7 TEST Test input for test speed-up; must be connected to Vsg when not in use
(power down mode, see figures)
8 VDD Positive supply