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M27C256B-10B1 View Datasheet(PDF) - STMicroelectronics

Part NameM27C256B-10B1 ST-Microelectronics
STMicroelectronics ST-Microelectronics
Description256 Kbit (32Kb × 8) UV EPROM and OTP EPROM
M27C256B-10B1 Datasheet PDF : 24 Pages
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M27C256B
DC and AC parameters
)
Table 10.
Read mode AC characteristics 2(1) (2)
Symbol Alt
Parameter
M27C256B
Test
Condition
-90
-10
-12 -15/-20/-25 Unit
Min Max Min Max Min Max Min Max
tAVQV
tELQV
tACC
Address Valid to
Output Valid
tCE
Chip Enable Low
to Output Valid
E = VIL,
G = VIL
G = VIL
90
100
120
150 ns
90
100
120
150 ns
Output Enable
tGLQV tOE Low to Output
Valid
E = VIL
40
50
60
65 ns
t(s) tEHQZ(3)
tDF
Chip Enable High
to Output Hi-Z
G = VIL
0 30 0 30 0 40
0
50 ns
uc Output Enable
rod tGHQZ(3) tDF High to Output
Hi-Z
E = VIL 0 30 0 30 0 40 0 50 ns
lete P tAXQX
Address
tOH Transition to
Output Transition
E = VIL,
G = VIL
0
0
0
0
ns
o 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
bs 2. VCC must be applied simultaneously with or before VPP and removed simultaneously or after VPP.
Obsolete Product(s) - O 3. Sampled only, not 100% tested.
17/24
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Summary description
The M27C256B is a 256 Kbit EPROM offered in the two ranges UV (ultra violet erase) and OTP (one time programmable). It is ideally suited for microprocessor systems and is organized as 32,768 by 8 bits.
The FDIP28W (window ceramic frit-seal package) 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 M27C256B is offered in PDIP28 and PLCC32 packages.
LButtonIn order to meet environmental requirements, ST offers the M27C256B in ECOPACK® packages.
ECOPACK packages are Lead-free. The category of second Level Interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97.
The maximum ratings related to soldering conditions are also marked on the inner box label.
ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com.

Feature summary
■ 5V ± 10% supply voltage in Read operation
■ Access time: 45ns
■ Low power consumption:
   – Active Current 30mA at 5MHz
   – Standby Current 100µA
■ Programming voltage: 12.75V ± 0.25V
■ Programming time: 100µs/Word
■ Electronic signature
   – Manufacturer Code: 20h
   – Device Code: 8Dh
■ ECOPACK® packages available

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