A27020 Ver la hoja de datos (PDF) - AMIC Technology
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A27020 Datasheet PDF : 14 Pages
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A27020 Series
Programming and Program Verify
The programming flowchart is shown in Page 10.
The A27020 is shipped with all bits being set to "1".
Programming causes relevant bits to be changed to "0".
The programming mode is started by setting VCC to
+6.25V and VPP to +12.75V, while CE and PGM are at
VIL, and OE is at VIH. Data to be programmed can be
directly input in the 8 bit format through the data bus.
The write programming algorithm reduces programming
time by using 100µs pulse followed by a byte verification
to determine whether the byte has been successfully
programmed. If the data does not pass the verification,
an additional pulse programming is applied for a
maximum of 25 pulses. On completion of 1 byte
programming and, The verified address is incremented.
After the final address is completed, all bytes are verified
again with VCC = 5.0 Volt.
Program Inhibit
This mode is used to program one of multiple A27020
whose OE , PGM , VPP, VCC, address bus and data bus
are connected in parallel. When programming is
performed, other A27020 can be inhibited from being
programmed by setting their CE pins to VIH.
Programming Mode DC Characteristics (Ta = 0°C to 70°C, VCC = 6.25V ± 0.25V, VPP = 12.75V ± 0.25V)
Symbol
Parameter
Min.
Max.
Unit
Test Conditions
VOH Output High Voltage
2.4
V
IOH = -400µA
VOL
Output Low Voltage
0.4
V
IOL = 2.1mA
VIH
Input High Voltage
2.0
VCC + 0.5
V
VIL
Input Low Voltage
-0.5
0.8
V
ILI
Input Leakage Current
-1
+1
µA VCC = max. Vin = 0V to VCC
ICC
VCC Current During Program
50
mA
IPP
VPP Current During Program
50
mA
CE = VIL
VID
A9 Auto Select Voltage
11.5
12.5
V
A9 = VID
VCC1 Programming Supply Voltage
6.0
6.5
V
VPP1 Programming Voltage
12.5
13
V
Note: VCC must be applied simultaneously or before VPP and removed simultaneously or after VPP.
PRELIMINARY (August, 2002, Version 0.0)
7
AMIC Technology, Inc.
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