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M87C257-15C6

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P22
Obsolete Product(s) - Obsolete Product(s)
DC and AC parameters M87C257
16/22
Table 10. Read mode AC characteristics 2
(1)
(2)
1. T
A
= 0 to 70 °C, –40 to 85 °C; –40 to 105 °C or –40 to 125 °C; V
CC
= 5V ± 5% or 5V ± 10%; V
PP
= V
CC
2. V
CC
must be applied simultaneously with or before V
PP
and removed simultaneously or after V
PP
.
Symbol Alt Parameter
Test
Condition
M87C257
Unit-90 -10 -12 -15/-20
Min Max Min Max Min Max Min Max
t
AVQV
t
ACC
Address Valid to
Output Valid
E = V
IL
,
G = V
IL
90 100 120 150 ns
t
AVASL
t
AL
Address Valid to
Address Strobe Low
7777ns
t
ASHASL
t
LL
Address Strobe
High to Address
Strobe Low
35 35 35 35 ns
t
ASLAX
t
LA
Address Strobe Low
to Address
Tra ns iti on
20 20 20 20 ns
t
ASLGL
t
LOE
Address Strobe Low
to Output Enable
Low
20 20 20 20 ns
t
ELQV
t
CE
Chip Enable Low to
Output Valid
G
= V
IL
90 100 120 150 ns
t
GLQV
t
OE
Output Enable Low
to Output Valid
E
= V
IL
40 40 50 60 ns
t
EHQZ
(3)
3. Sampled only, not 100% tested.
t
DF
Chip Enable High to
Output Hi-Z
G
= V
IL
040030040040ns
t
GHQZ
(3)
t
DF
Output Enable High
to Output Hi-Z
E
= V
IL
040030040040ns
t
AXQX
t
OH
Address Transition
to Output Transition
E = V
IL
,
G = V
IL
0000ns
Obsolete Product(s) - Obsolete Product(s)
Obsolete Product(s) - Obsolete Product(s)
M87C257 DC and AC parameters
17/22
Figure 8. Programming and Verify modes AC waveforms
Table 11. Programming mode AC characteristics
(1)
(2)
1. T
A
= 25 °C; V
CC
= 6.25V ± 0.25V; V
PP
= 12.75V ± 0.25V
2. V
CC
must be applied simultaneously with or before V
PP
and removed simultaneously or after V
PP
.
Symbol Alt Parameter
Test
Condition
Min Max Unit
t
AVEL
t
AS
Address Valid to Chip Enable Low 2 µs
t
QVEL
t
DS
Input Valid to Chip Enable Low 2 µs
t
VPHEL
t
VPS
V
PP
High to Chip Enable Low 2 µs
t
VCHEL
t
VCS
V
CC
High to Chip Enable Low 2 µs
t
ELEH
t
PW
Chip Enable Program Pulse Width 95 105 µs
t
EHQX
t
DH
Chip Enable High to Input Transition 2 µs
t
QXGL
t
OES
Input Transition to Output Enable Low 2 µs
t
GLQV
t
OE
Output Enable Low to Output Valid 100 ns
t
GHQZ
t
DFP
Output Enable High to Output Hi-Z 0 130 ns
t
GHAX
t
AH
Output Enable High to Address
Transition
0ns
tAVEL
VALID
AI00557
A0-A14
Q0-Q7
ASV
PP
V
CC
G
DATA IN DATA OUT
E
tQVEL
tVPHEL
tVCHEL
tEHQX
tELEH
tGLQV
tQXGL
tGHQZ
tGHAX
PROGRAM VERIFY
Obsolete Product(s) - Obsolete Product(s)
Obsolete Product(s) - Obsolete Product(s)
Package mechanical M87C257
18/22
5 Package mechanical
Figure 9. FDIP28W - 28 pin Ceramic Frit-seal DIP, with window, package outline
1. Drawing is not to scale.
Table 12. FDIP28WB - 28 pin Ceramic Frit-seal DIP, with window (round 0.280"),
package mechanical data
Symbol
millimeters inches
Typ Min Max Typ Min Max
A5.720.225
A1 0.51 1.40 0.020 0.055
A2 3.91 4.57 0.154 0.180
A3 3.89 4.50 0.153 0.177
B 0.41 0.56 0.016 0.022
B1 1.45 – – 0.057 – –
C 0.23 0.30 0.009 0.012
D 36.50 37.34 1.437 1.470
D233.02– –1.300– –
E 15.24 – – 0.600 – –
E1 13.06 13.36 0.514 0.526
e2.54– –0.100– –
eA 14.99 – – 0.590 – –
eB 16.18 18.03 0.637 0.710
L 3.18 4.10 0.125 0.161
α 4° 11° 4° 11°
S 1.52 2.49 0.060 0.098
Ø7.11– –0.280– –
N28 28
FDIPW-a
A3
A1
A
L
B1 B
e
D
S
E1 E
N
1
C
α
eA
D2
∅
eB
A2
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M87C257-15C6

Mfr. #:
Buy M87C257-15C6
Manufacturer:
STMicroelectronics
Description:
IC EPROM 256K PARALLEL 32PLCC
Lifecycle:
New from this manufacturer.
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