M27C320-100M1 STMicroelectronics, M27C320-100M1 Datasheet - Page 10

• Manufacturer Part Number: M27C320-100M1
• Manufacturer: STMicroelectronics

Specifications of M27C320-100M1

• Density: 32Mb
• Organization: 2Mx16/4Mx8
• Interface Type: Parallel
• Bus Type: Parallel
• In System Programmable: External
• Access Time (max): 100ns
• Package Type: SO
• Reprogramming Technique: OTP
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (min): 4.5V
• Operating Supply Voltage (max): 5.5V
• Supply Current: 70mA
• Pin Count: 44
• Mounting: Surface Mount
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Lead Free Status / RoHS Status: Not Compliant

M27C320
Figure 9. Programming and Verify Modes AC Waveforms
Note: BYTE = V
Figure 10. Programming Flowchart
10/15
YES
NO
FAIL
= 25
++n
A0-A20
Q0-Q15
V CC
GV PP
E
IH
; GV
V CC = 6.25V, V PP = 12V
RESET MARGIN MODE
CHECK ALL WORDS
SET MARGIN MODE
PP
NO
2nd: V CC = 4.2V
1st: V CC = 6V
E = 50 s Pulse
High level = 12V.
BYTE = V IH
VERIFY
n = 0
Addr
Last
YES
YES
NO
tVCHEL
tVPHEL
tQVEL
tAVEL
++ Addr
DATA IN
AI02220
PROGRAM
VALID
tELEH
tEHQX
PRESTO III Programming Algorithm
The PRESTO III Programming Algorithm allows
the whole array to be programed with a guaran-
teed margin in a typical time of 100 seconds. Pro-
gramming with PRESTO III consists of applying a
sequence of 50 s program pulses to each word
until a correct verify occurs (see Figure 10). During
programing and verify operation a MARGIN
MODE circuit must be activated to guarantee that
each cell is programed with enough margin. No
overprogram pulse is applied since the verify in
MARGIN MODE provides the necessary margin to
each programmed cell.
Program Inhibit
Programming of multiple M27C320s in parallel
with different data is also easily accomplished. Ex-
cept for E, all like inputs including G of the parallel
M27C320 may be common. A TTL low level pulse
applied to a M27C320’s E input and V
will program that M27C320. A high level E input in-
hibits the other M27C320s from being pro-
grammed.
Program Verify
A verify (read) should be performed on the pro-
grammed bits to determine that they were correct-
ly programmed. The verify is accomplished with G
at V
falling edge of E.
tEHVPX
IL
. Data should be verified with t
tVPLEL
VERIFY
tELQV
DATA OUT
tEHAX
tEHQZ
AI02205
ELQV
PP
after the
at 12V,