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PDF EN27C512 Data sheet ( Hoja de datos )

Número de pieza EN27C512
Descripción 512KBIT EPROM
Fabricantes EON 
Logotipo EON Logotipo



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No Preview Available ! EN27C512 Hoja de datos, Descripción, Manual

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EN27C512 512KBIT EPROM (64K x 8)
EN27C512
FEATURES
Fast Read Access Time:
-45, -55, -70, and -90ns
Single 5V Power Supply
Programming Voltage +12.75V
QuikRiteTM Programming Algorithm
Typical programming time 20µs
Low Power CMOS Operation
1µA Standby (Typical)
30mA Operation (Max.)
CMOS- and TTL-Compatible I/O
High-Reliability CMOS Technology
Latch-Up Immunity to 100mA
from -1V to VCC + 1V
Two-Line Control ( OE & CE )
Standard Product Identification Code
JEDEC Standard Pinout
28-pin PDIP
32-pin PLCC
28-pin TSOP (Type 1)
Commercial and Industrial Temperature
Ranges
GENERAL DESCRIPTION
The EN27C512 is a low-power 512Kbit, 5V-only one-time-programmable (OTP) read-only
memory (EPROM). Organized into 64K words with 8 bits per word, it features QuikRiteTM single-
address location programming, typically at 20µs per byte. Any byte can be accessed in less than
45ns, eliminating the need for WAIT states in high-performance microprocessor systems. The
EN27C512 has separate Output Enable ( OE ) and Chip Enable ( CE ) controls which eliminate
bus contention issues.
FIGURE 1. PDIP
Pin Name
A0-A15
DQ0-DQ7
CE
OE
NC
Function
Addresses
Outputs
Chip Enable
Output Enable
No Connect
4800 Great America Parkway Ste 202
Santa Clara, CA. 95054
1
Tel: 408-235-8680
Fax: 408-235-8685

1 page




EN27C512 pdf
EN27C512
READ MODE
The EN27C512 has two control functions, both of which must be logically satisfied in order to
obtain data at the outputs. Chip Enable ( CE ) is the power control and should be used for
device selection. Output Enable ( OE ) is the output control and should be used to gate data to
the output pins, independent of device selection. Assuming that addresses are stable,
address access time (tACC) is equal to the delay from CE to output (tCE) . Data is available at
the outputs (tOE) after the falling edge of OE , assuming the CE has been LOW and
addresses have been stable for at least tACC - tOE.
STANDBY MODE
The EN27C512 has CMOS standby mode which reduces the maximum VCC current to 20µA.
It is placed in CMOS standby when CE is at VCC ± 0.3 V. The EN27C512 also has a TTL-
standby mode which reduces the maximum VCC current to 1.0 mA. It is placed in TTL-
standby when CE is at VIH. When in standby mode, the outputs are in a high-impedance
state, independent of the OE input.
TWO-LINE OUTPUT CONTROL FUNCTION
To accommodate multiple memory connections, a two-line control function is provided to allow
for:
1. Low memory power dissipation,
2. Assurance that output bus contention will not occur.
It is recommended that CE be decoded and used as the primary device-selection function, while
OE be made a common connection to all devices in the array and connected to the READ line
from the system control bus. This assures that all deselected memory devices are in their low-
power standby mode and that the output pins are only active when data is desired from a
particular memory device.
SYSTEM CONSIDERATIONS
During the switch between active and standby conditions, transient current peaks are produced
on the rising and falling edges of Chip Enable. The magnitude of these transient current peaks
is dependent on the output capacitance loading of the device. At a minimum, a 0.1µF ceramic
capacitor (high frequency, low inherent inductance) should be used on each device between VCC
and VSS to minimize transient effects. In addition, to overcome the voltage drop caused by the
inductive effects of the printed circuit board traces on EPROM arrays, a 4.7µF bulk electrolytic
capacitor should be used between VCC and VSS for each eight devices. The location of the
capacitor should be close to where the power supply is connected to the array.
4800 Great America Parkway Ste 202
Santa Clara, CA. 95054
5
Tel: 408-235-8680
Fax: 408-235-8685

5 Page





EN27C512 arduino
EN27C512
FIGURE 8. PROGRAMMING WAVEFORMS
4800 Great America Parkway Ste 202
Santa Clara, CA. 95054
11
Tel: 408-235-8680
Fax: 408-235-8685

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