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M87C257 Schematic ( PDF Datasheet ) - ST Microelectronics

Teilenummer M87C257
Beschreibung ADDRESS LATCHED 256K 32K x 8 UV EPROM and OTP EPROM
Hersteller ST Microelectronics
Logo ST Microelectronics Logo 




Gesamt 13 Seiten
M87C257 Datasheet, Funktion
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






M87C257 Datasheet, Funktion
M87C257
Table 8B. 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
tAVQV
tAVASL
tACC
Address Valid to
Output Valid
tAL
Address Valid to
Address Strobe Low
Test
Condition
E = VIL, G = VIL
M87C257
-90 -10 -12 -15/-20 Unit
Min Max Min Max Min Max Min Max
90 100 120 150 ns
7 7 7 7 ns
tASHASL
tLL
Address Strobe High
to Address Strobe Low
35 35 35 35 ns
tASLAX
tASLGL
tELQV
tLA
Address Strobe Low to
Address Transition
tLOE
Address Strobe Low
to Output Enable Low
tCE
Chip Enable Low to
Output Valid
G = VIL
20 20 20 20 ns
20 20 20 20 ns
90 100 120 150 ns
tGLQV
tEHQZ (2)
tGHQZ (2)
tOE
Output Enable Low to
Output Valid
tDF
Chip Enable High to
Output Hi-Z
tDF
Output Enable High to
Output Hi-Z
E = VIL
G = VIL
E = VIL
40 40 50 60 ns
0 40 0 30 0 40 0 40 ns
0 40 0 30 0 40 0 40 ns
tAXQX
tOH
Address Transition to
Output Transition
E = VIL, G = VIL
0
0
0
Notes: 1. VCC must be applied simultaneously with or before VPP and removed simultaneously or after VPP.
2. Sampled only, not 100% tested.
0 ns
Figure 5. Read Mode AC Waveforms
A0-A14
ASVPP
E
G
Q0-Q7
VALID
tAVASL
tASLAX
tASHASL
tASLGL
tAVQV
tGLQV
tELQV
tAXQX
tEHQZ
tGHQZ
DATA OUT
Hi-Z
AI00931
6/13

6 Page









M87C257 pdf, datenblatt
M87C257
PLCC32 - 32 lead Plastic Leaded Chip Carrier, rectangular
Symb
mm
inches
Typ Min Max Typ Min Max
A
2.54 3.56
0.100
0.140
A1
1.52 2.41
0.060
0.095
B
0.33 0.53
0.013
0.021
B1
0.66 0.81
0.026
0.032
D
12.32
12.57
0.485
0.495
D1
11.35
11.56
0.447
0.455
D2
9.91 10.92
0.390
0.430
E
14.86
15.11
0.585
0.595
E1
13.89
14.10
0.547
0.555
E2
12.45
13.46
0.490
0.530
e 1.27 –
– 0.050 –
N 32
32
Nd 7
7
Ne 9
9
CP 0.10 0.004
PLCC32
D
D1
1N
A1
B1
Ne
E1 E D2/E2
e
B
PLCC
Drawing is not to scale
12/13
Nd
A
CP

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