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PDF M27C257 Data sheet ( Hoja de datos )

Número de pieza M27C257
Descripción ADDRESS LATCHED 256K (32K x 8) UV EPROM and OTP EPROM
Fabricantes STMicroelectronics 
Logotipo STMicroelectronics Logotipo



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No Preview Available ! M27C257 Hoja de datos, Descripción, Manual

M87C257
ADDRESS LATCHED
256K (32K x 8) UV EPROM and OTP EPROM
INTEGRATED ADDRESS LATCH
FAST ACCESS TIME: 45ns
LOW POWER “CMOS” CONSUMPTION:
– Active Current 30mA
– Standby Current 100µA
PROGRAMMING VOLTAGE: 12.75V
ELECTRONIC SIGNATURE for AUTOMATED
PROGRAMMING
PROGRAMMING TIMES of AROUND 3sec.
(PRESTO II ALGORITHM)
28
1
FDIP28W (F)
PLCC32 (C)
DESCRIPTION
The M87C257 is a high speed 262,144 bit UV
erasable and electrically programmable EPROM.
The M87C257 incorporates latches for all address
inputs to minimize chip count, reduce cost, and
simplify the design of multiplexed bus systems.
The Window Ceramic Frit-Seal Dual-in-Line pack-
age has a transparent lid which allows the user to
expose the chip to ultraviolet light to erase the bit
pattern. A new pattern can then be written to the
device by following the programming procedure.
For applications where the content is programmed
only one time and erasure is not required, the
M87C257 is offered in Plastic Leaded Chip Carrier,
package.
Table 1. Signal Names
A0 - A14
Address Inputs
Q0 - Q7
Data Outputs
E Chip Enable
G Output Enable
ASVPP
VCC
VSS
Address Strobe / Program Supply
Supply Voltage
Ground
Figure 1. Logic Diagram
VCC
15
A0-A14
E
G
ASVPP
M87C257
VSS
8
Q0-Q7
AI00928B
June 1996
1/13

1 page




M27C257 pdf
M87C257
Table 7. Read Mode DC Characteristics (1)
(TA = 0 to 70°C, –40 to 85°C, –40 to 105°C or –40 to 125°C; VCC = 5V ± 5% or 5V ± 10%; VPP = VCC)
Symbol
Parameter
Test Condition
Min Max Unit
ILI Input Leakage Current
0V VIN VCC
ILO Output Leakage Current
0V VOUT VCC
ICC Supply Current
E = VIL, G = VIL,
IOUT = 0mA, f = 5MHz
ICC1
Supply Current
(Standby) TTL
E = VIH, ASVPP = VIH, Address Switching
E = VIH, ASVPP = VIL, Address Stable
ICC2
Supply Current (Standby)
CMOS
E VCC – 0.2V, ASVPP VCC – 0.2V,
Address Switching
E VCC – 0.2V, ASVPP = VSS,
Address Stable
±10 µA
±10 µA
30 mA
10 mA
1 mA
6 mA
100 µA
IPP Program Current
VPP = VCC
VIL
VIH (2)
Input Low Voltage
Input High Voltage
–0.3
2
VOL Output Low Voltage
IOL = 2.1mA
VOH Output High Voltage
IOH = –1mA
VCC – 0.8V
Notes: 1. VCC must be applied simultaneously with or before VPP and removed simultaneously or after VPP.
2. Maximum DC voltage on Output is VCC +0.5V.
100
0.8
VCC + 1
0.4
µA
V
V
V
V
Table 8A. Read Mode AC Characteristics (1)
(TA = 0 to 70°C, –40 to 85°C, –40 to 105°C or –40 to 125°C; VCC = 5V ± 5% or 5V ± 10%; VPP = VCC)
Symbol Alt
Parameter
Test
Condition
-45 (3)
M87C257
-60 -70
-80 Unit
Min Max Min Max Min Max Min Max
tAVQV
tACC
Address Valid to
Output Valid
E = VIL, G = VIL
45 60 70 80 ns
tAVASL
tAL
Address Valid to
Address Strobe Low
7 7 7 7 ns
tASHASL
tLL
Address Strobe High
to Address Strobe Low
35 35 35 35 ns
tASLAX
tLA
Address Strobe Low to
Address Transition
20 20 20 20 ns
tASLGL
tLOE
Address Strobe Low to
Output Enable Low
20 20 20 20 ns
tELQV
tCE
Chip Enable Low to
Output Valid
G = VIL
45 60 70 80 ns
tGLQV
tOE
Output Enable Low to
Output Valid
E = VIL
25 30 35 40 ns
tEHQZ (2)
tDF
Chip Enable High to
Output Hi-Z
G = VIL
0 25 0 30 0 30 0 40 ns
tGHQZ (2)
tDF
Output Enable High to
Output Hi-Z
E = VIL
0 25 0 30 0 30 0 40 ns
tAXQX
tOH
Address Transition to
Output Transition
E = VIL,
G = VIL
0
0
0
0 ns
Notes: 1. VCC must be applied simultaneously with or before VPP and removed simultaneously or after VPP.
2. Sampled only, not 100% tested.
3. In case of 45ns speed see High Speed AC measurement conditions.
5/13

5 Page





M27C257 arduino
M87C257
Symb
A
A1
A2
B
B1
C
D
E
E1
e1
e3
eA
L
S
α
N
FDIP28W
FDIP28W - 28 pin Ceramic Frit-seal DIP, with window
Typ
2.54
33.02
7.11
mm
Min
0.50
3.90
0.40
1.17
0.22
15.40
13.05
16.17
3.18
1.52
4°
28
Max
5.71
1.78
5.08
0.55
1.42
0.31
38.10
15.80
13.36
18.32
4.10
2.49
15°
Typ
0.100
1.300
0.280
inches
Min
0.020
0.154
0.016
0.046
0.009
0.606
0.514
0.637
0.125
0.060
4°
28
Max
0.225
0.070
0.200
0.022
0.056
0.012
1.500
0.622
0.526
0.721
0.161
0.098
15°
A2 A
B1
S
N
A1 L
B e1
e3
D
E1 E
1
Drawing is not to scale
αC
eA
FDIPW-a
11/13

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