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54
DS2251T–128 BLOCK DIAGRAM Figure 5–6
DS2251T
DS5001FP 128K X 8 SRAM
REAL TIME CLOCK
BYTE–WIDE ADDRESS BUS
BYTE–WIDE DATA BUS
(14)
(8)
(8)
(8)
(8)
(8)
R/W
INTA
INTB
INTP
SQW
+3V
V
LI
V
CC
PORT0
PORT1
PORT2
PORT3
ALE
RST
PSEN
PROG
PF
VRST
PE3
PE4
XTAL1
XTAL2
GND
V
CCO
ADDR
R/W
DATA
CE1
PE1
72 PINS
DS1283