M27C64A-20F1 STMicroelectronics, M27C64A-20F1 Datasheet - Page 8

• Manufacturer Part Number: M27C64A-20F1
• Description: IC EPROM 64KBIT 200NS 28CDIP
• Manufacturer: STMicroelectronics

Specifications of M27C64A-20F1

• Format - Memory: EPROMs
• Memory Type: UV EPROM
• Memory Size: 64K (8K x 8)
• Speed: 200ns
• Interface: Parallel
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: 0°C ~ 70°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 (Max.)
• Density: 64K
• Organization: 8K×8
• Package Type: FDIP28W
• Temperature, Operating: 0 to +70 °C
• Temperature, Operating, Maximum: 85 °C
• Temperature, Operating, Minimum: -40 °C
• Time, Access: 200 ns
• Time, Fall: ≤20 ns
• 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: -0.3 V (Max.)
• Voltage, Output, High: 4.3 V (Read)
• Voltage, Output, Low: 0.4 V (Read)
• Voltage, Programmable: 11.5 V (Min.)
• Voltage, Supply: 5 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-1686-5

Device operation
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2.4
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Device operation
The modes of operation of the M27C64A are listed in the Operating Modes table. A single
power supply is required in the read mode. All inputs are TTL levels except for V
on A9 for Electronic Signature.
Read mode
The M27C64A has two control functions, both of which must be logically active in order to
obtain data at the outputs. Chip Enable (E) is the power control and should be used for
device selection. Output Enable (G) is the output control and should be used to gate data to
the output pins, independent of device selection. Assuming that the addresses are stable,
the address access time (t
available at the output after a delay of t
been low and the addresses have been stable for at least t
Standby mode
The M27C64A has a standby mode which reduces the active current from 30mA to 100µA.
The M27C64A is placed in the standby mode by applying a CMOS high signal to the E input.
When in the standby mode, the outputs are in a high impedance state, independent of the G
input.
Two Line output control
Because EPROMs are usually used in larger memory arrays, this product features a 2 line
control function which accommodates the use of multiple memory connection. The two line
control function allows:
For the most efficient use of these two control lines, E should be decoded and used as the
primary device selecting function, while G should be made a common connection to all
devices in the array and connected to the READ line from the system control bus. This
ensures that all deselected memory devices are in their low power standby mode and that
the output pins are only active when data is required from a particular memory device.
System considerations
The power switching characteristics of Advanced CMOS EPROMs require careful
decoupling of the devices. The supply current, I
the system designer: the standby current level, the active current level, and transient current
peaks that are produced by the falling and rising edges of E. The magnitude of the transient
current peaks is dependent on the capacitive and inductive loading of the device at the
output. The associated transient voltage peaks can be suppressed by complying with the
two line output control and by properly selected decoupling capacitors. It is recommended
that a 0.1µF ceramic capacitor be used on every device between V
The lowest possible memory power dissipation
Complete assurance that output bus contention will not occur
AVQV
) is equal to the delay from E to output (t
GLQV
from the falling edge of G, assuming that E has
CC
, has three segments that are of interest to
AVQV
-t
GLQV
CC
.
and V
ELQV
SS
). Data is
. This should
PP
M27C64A
and 12V