
28F128J3A, 28F640J3A, 28F320J3A
Preliminary
3
Table 1. Lead Descriptions
Symbol
Type
Name and Function
A
0
INPUT
BYTE-SELECT ADDRESS:
 Selects between high and low byte when the device is in x8 mode. This 
address is latched during a x8 program cycle. Not used in x16 mode (i.e., the A
0
 input buffer is turned 
off when BYTE# is high).
A
1
–
A
23
INPUT
ADDRESS INPUTS:
 Inputs for addresses during read and program operations. Addresses are 
internally latched during a program cycle.
32-Mbit: A
0
–
A
21
64-Mbit: A
0
–
A
22
128-Mbit: A
0
–
A
23
DQ
0
–
DQ
7
INPUT/
OUTPUT
LOW-BYTE DATA BUS:
 Inputs data during buffer writes and programming, and inputs commands 
during Command User Interface (CUI) writes. Outputs array, query, identifier, or status data in the 
appropriate read mode. Floated when the chip is de-selected or the outputs are disabled. Outputs 
DQ
6
–
DQ
0
 are also floated when the Write State Machine (WSM) is busy. Check SR.7 (status register 
bit 7) to determine WSM status.
DQ
8
–
DQ
15
INPUT/
OUTPUT
HIGH-BYTE DATA BUS: 
Inputs data during x16 buffer writes and programming operations. Outputs 
array, query, or identifier data in the appropriate read mode; not used for status register reads. Floated 
when the chip is de-selected, the outputs are disabled, or the WSM is busy.
CE
0
,
CE
1
,
CE
2
INPUT
CHIP ENABLES:
 Activates the device
’
s control logic, input buffers, decoders, and sense amplifiers. 
When the device is de-selected (see 
Table 2 on page 7
), power reduces to standby levels.
All timing specifications are the same for these three signals. Device selection occurs with the first 
edge of CE
0
, CE
1
, or CE
2
 that enables the device. Device deselection occurs with the first edge of 
CE
0
, CE
1
, or CE
2
 that disables the device (see 
Table 2 on page 7
). 
RP#
INPUT
RESET/ POWER-DOWN:
 Resets internal automation and puts the device in power-down mode. RP#-
high enables normal operation. Exit from reset sets the device to read array mode. When driven low, 
RP# inhibits write operations which provides data protection during power transitions.
OE#
INPUT
OUTPUT ENABLE:
 Activates the device
’
s outputs through the data buffers during a read cycle. OE# is 
active low.
WE#
INPUT
WRITE ENABLE:
 Controls writes to the Command User Interface, the Write Buffer, and array blocks. 
WE# is active low. Addresses and data are latched on the rising edge of the WE# pulse.
STS
OPEN 
DRAIN 
OUTPUT
STATUS:
 Indicates the status of the internal state machine. When configured in level mode (default 
mode), it acts as a RY/BY# pin. When configured in one of its pulse modes, it can pulse to indicate 
program and/or erase completion. For alternate configurations of the STATUS pin, see the 
Configurations command. Tie STS to V
CCQ
 with a pull-up resistor.
BYTE#
INPUT
BYTE ENABLE: 
BYTE# low places the device in x8 mode. All data is then input or output on DQ
0
–
DQ
7
, while DQ
8
–
DQ
15
 float. Address A
0
 selects between the high and low byte. BYTE# high places 
the device in x16 mode, and turns off the A
0
 input buffer. Address A
1
 then becomes the lowest order 
address.
V
PEN
INPUT
ERASE / PROGRAM / BLOCK LOCK ENABLE:
 For erasing array blocks, programming data, or 
configuring lock-bits.
With V
PEN
≤
 V
PENLK
, memory contents cannot be altered.
DEVICE POWER SUPPLY:
 With V
CC
≤
 V
LKO
, all write attempts to the flash memory are inhibited.
V
CC
SUPPLY
V
CCQ
OUTPUT 
BUFFER 
SUPPLY
OUTPUT BUFFER POWER SUPPLY:
 This voltage controls the device
’
s output voltages. To obtain 
output voltages compatible with system data bus voltages, connect V
CCQ
 to the system supply voltage.
GND
SUPPLY
GROUND:
 Do not float any ground pins.
NC
NO CONNECT:
 Lead is not internally connected; it may be driven or floated.
DU
DON
’
T USE:
 Do not drive ball to V
IH
 or V
IL
, leave disconnected