M27C1024-35C1 STMicroelectronics, M27C1024-35C1 Datasheet - Page 8

• Manufacturer Part Number: M27C1024-35C1
• Manufacturer: STMicroelectronics

Specifications of M27C1024-35C1

• Density: 1Mb
• Organization: 64Kx16
• Interface Type: Parallel
• Bus Type: Parallel
• In System Programmable: External
• Access Time (max): 35ns
• Package Type: PLCC
• Reprogramming Technique: OTP
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (min): 4.5V
• Operating Supply Voltage (max): 5.5V
• Supply Current: 50mA
• Pin Count: 44
• Mounting: Surface Mount
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Lead Free Status / RoHS Status: Not Compliant

M27C1024
Figure 8. Programming and Verify Modes AC Waveforms
Figure 9. Programming Flowchart
8/16
YES
NO
FAIL
= 25
++n
V CC
A0-A15
Q0-Q15
V PP
E
P
G
V CC = 6.25V, V PP = 12.75V
CHECK ALL WORDS
NO
2nd: V CC = 4.2V
P = 100 s Pulse
1st: V CC = 6V
VERIFY
n = 0
Addr
Last
YES
YES
NO
tVPHPL
tVCHPL
tQVPL
tAVPL
tELPL
tPLPH
++ Addr
DATA IN
AI00707C
PROGRAM
VALID
tPHQX
PRESTO II Programming Algorithm
PRESTO II Programming Algorithm allows pro-
gramming of the whole array with a guaranteed
margin, in a typical time of 6.5 seconds. Program-
ming with PRESTO II consists of applying a se-
quence of 100 s program pulses to each word
until a correct verify occurs (see Figure 9). During
programming and verify operation, a MARGIN
MODE circuit is automatically activated in order to
guarantee that each cell is programmed with
enough margin. No overprogram pulse is applied
since the verify in MARGIN MODE provides nec-
essary margin to each programmed cell.
Program Inhibit
Programming of multiple M27C1024s in parallel
with different data is also easily accomplished. Ex-
cept for E, all like inputs including G of the parallel
M27C1024 may be common. A TTL low level
pulse applied to a M27C1024’ s P input, with E low
and V
A high level E input inhibits the other M27C1024s
from being programmed.
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 E
and G at V
6.25V.
tQXGL
PP
VERIFY
tGLQV
at 12.75V, will program that M27C1024.
DATA OUT
IL
, P at V
IH
, V
PP
tGHQZ
tGHAX
at 12.75V and V
AI00706
CC
at