M27C256B-12F6 STMicroelectronics, M27C256B-12F6 Datasheet - Page 5

• Manufacturer Part Number: M27C256B-12F6
• Description: IC EPROM 256KBIT 120NS 28CDIP
• Manufacturer: STMicroelectronics

Specifications of M27C256B-12F6

• Format - Memory: EPROMs
• Memory Type: UV EPROM
• Memory Size: 256K (32K x 8)
• Speed: 120ns
• Interface: Parallel
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-CDIP (0.600", 15.24mm) Window
• Capacitance, Input: 6 pF
• Capacitance, Output: 12 pF
• Current, Input, Leakage: ±10 μA (Read)
• Current, Operating: 30 mA (Read)
• Current, Output, Leakage: ±10 μA (Read)
• Current, Supply: 30 mA
• Density: 256K
• Organization: 32K×8
• Package Type: FDIP28W
• Temperature, Operating: -40 to +85 °C
• Temperature, Operating, Maximum: 85 °C
• Temperature, Operating, Minimum: -40 °C
• Time, Access: 120 ns
• Time, Fall: ≤20 ns
• Time, Programmable: 100 μA
• Time, Rise: ≤20 ns
• Voltage, Input, High: 6 V (Read)
• Voltage, Input, High Level: 2 V (Min.)
• Voltage, Input, Low: 0.8 V (Read)
• Voltage, Input, Low Level: 0.8 V (Typ.)
• Voltage, Output, High: 4.3 V (Read)
• Voltage, Output, Low: 0.4 V (Read)
• Voltage, Programmable: 12.75 V ± 0.25 V
• Voltage, Supply: 5 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-1647-5

M27C256B
1
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.
In 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.
Figure 1.
Logic diagram
A0-A14
G
E
15
V CC
M27C256B
V SS
V PP
8
Q0-Q7
AI00755B
Summary description
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