M27C4002
Figure 2A. DIP Pin Connections
Figure 2B. LCC Pin Connections
V
1
2
3
4
5
6
7
8
9
40
V
CC
PP
E
39 A17
38 A16
37 A15
36 A14
35 A13
34 A12
33 A11
32 A10
31 A9
Q15
Q14
Q13
Q12
Q11
Q10
Q9
1 44
Q12
A13
A12
A11
A10
A9
Q11
Q10
Q9
Q8
Q8 10
M27C4002
V
12
M27C4002
34
V
SS
SS
V
SS
11
30
V
SS
NC
Q7
Q6
Q5
Q4
NC
A8
A7
A6
A5
Q7 12
Q6 13
Q5 14
Q4 15
Q3 16
Q2 17
Q1 18
Q0 19
29 A8
28 A7
27 A6
26 A5
25 A4
24 A3
23 A2
22 A1
21 A0
23
AI00729
G
20
AI00728
Warning: NC = Not Connected.
DEVICE OPERATION
Figure 2C. TSOP Pin Connections
The operating modes of the M27C4002 are listed
in the OperatingModes table. A single power sup-
plyis requiredin theread mode. Allinputs are TTL
levels except for Vpp and 12V on A9 for Electronic
Signature.
A9
A10
A11
A12
A13
A14
A15
A16
A17
1
40
V
SS
A8
A7
A6
Read Mode
A5
The M27C4002 has two control functions, both of
which must be logically active in order to obtain
data at the outputs. Chip Enable (E) is the power
control and should be used for device selection.
OutputEnable(G) is the outputcontrol and should
be used to gate data to the output pins, inde-
pendent of device selection. Assuming that the
addresses are stable, the address access time
(tAVQV)is equalto thedelayfrom Etooutput(tELQV).
Datais availableat theoutputafter a delayof tGLQV
from the falling edge of G, assuming that E has
been low and the addresses have been stable for
A4
A3
A2
A1
V
10 M27C4002 31
A0
CC
(Normal)
V
11
30
G
PP
E
DQ0
DQ1
DQ2
DQ3
DQ4
DQ5
DQ6
DQ7
DQ15
DQ14
DQ13
DQ12
DQ11
DQ10
DQ9
at least tAVQV-tGLQV
.
Standby Mode
The M27C4002 has a standby mode which re-
ducesthe supplycurrentfrom 50mAto100µA. The
M27C4002 is placed in the standby mode by ap-
plying a CMOS high signal to the E input. Whenin
thestandby mode, theoutputs are in a high imped-
ance state, independentof the G input.
DQ8
20
21
V
SS
AI01831
2/16
STMICROELECTRONICS [ ST ]
