Philips LX700/21S/22S/25S Service Manual page 35

OCTAL BUFFER / LINE DRIVER
74HCT244
8-5
MULTI-PURPOSE FLASH
SST39SF020A
F B D
UNCTIONAL LOCK IAGRAM
Memory Address
Address Buffers & Latches
CE#
OE#
WE#
P A 32- PDIP
IN SSIGNMENTS FOR PIN
SST39SF040 SST39SF020A SST39SF010A
A18 NC
A16 A16
A15 A15
A12 A12
A7 A7
A6 A6
A5 A5
A4 A4
A3 A3
A2 A2
A1 A1
A0 A0
DQ0 DQ0 DQ0
DQ1 DQ1 DQ1
DQ2 DQ2 DQ2
V SS V SS
P D
IN ESCRIPTION
Symbol Pin Name Functions
1
A -A Address Inputs To provide memory addresses.
MS 0
During Sector-Erase A
DQ -DQ Data Input/output To output data during Read cycles and receive input data during Write cycles.
7 0
Data is internally latched during a Write cycle.
The outputs are in tri-state when OE# or CE# is high.
CE# Chip Enable To activate the device when CE# is low.
OE# Output Enable To gate the data output buffers.
WE# Write Enable To control the Write operations.
V Power Supply To provide 5.0V supply (4.5-5.5V)
DD
V Ground
SS
NC No Connection Unconnected pins.
1. A = Most significant address
MS
A = A for SST39SF010A, A for SST39SF020A, and A
MS 16 17
8-5
SuperFlash
X-Decoder
Memory
Y-Decoder
I/O Buffers and Data Latches
Control Logic
DQ 7 - DQ 0
SST39SF010A SST39SF020A SST39SF040
NC 1 32 V DD V DD V DD
A16 2 31 WE# WE# WE#
3 30
A15 NC A17 A17
A12 4 29 A14 A14 A14
A7 5 28 A13 A13 A13
32-pin
6 27
A6 A8 A8 A8
PDIP
A5 7 26 A9 A9 A9
A4 8 25 A11 A11 A11
Top View
A3 9 24 OE# OE# OE#
A2 10 23 A10 A10 A10
A1 11 22 CE# CE# CE#
A0 12 21 DQ7 DQ7 DQ7
13 20 DQ6 DQ6 DQ6
14 19
DQ5 DQ5 DQ5
15 18 DQ4 DQ4 DQ4
V SS 16 17 DQ3 DQ3 DQ3
398 ILL F02a.2
-A address lines will select the sector.
MS 12
for SST39SF040
18
398 ILL B1.2