28C64AT-25/L Microchip Technology, 28C64AT-25/L Datasheet - Page 5

• Manufacturer Part Number: 28C64AT-25/L
• Description: IC EEPROM 64KBIT 250NS 32PLCC
• Manufacturer: Microchip Technology

Specifications of 28C64AT-25/L

• Format - Memory: EEPROMs - Parallel
• Memory Type: EEPROM
• Memory Size: 64K (8K x 8)
• Speed: 250ns
• Interface: Parallel
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 32-PLCC
• Lead Free Status / RoHS Status: Request inventory verification / Request inventory verification

FIGURE 1-3:
FIGURE 1-4:
TABLE 1-5:
Chip Clear
Extra Row Read
Extra Row Write
2004 Microchip Technology Inc.
Note:
WE
CE
OE
Address
Data
V
V
V
V
V
WE
V
CE
OE
IH
IL
IH
IH
IL
H
Mode
V
V
V
V
V
V
H
V
V
V
V
V
IL
IH
IL
IH
IL
IH
IL
IH
IL
IH
= 12.0V 0.5V.
DATA POLLING WAVEFORMS
CHIP CLEAR WAVEFORMS
SUPPLEMENTARY CONTROL
Address Valid
t
DV
t
CE
V
V
WPL
*
IL
IL
Data In
Valid
*Pulsed per programming waveforms.
t
t
WPH
S
OE
V
V
V
IH
IH
IL
t
WC
WE
V
V
*
IH
IL
t
W
A9 = V
A9 = V
t
CE
A9
X
t
t
OE
ACC
H
H
t
Address Valid
H
I/O7 Out
V
Last Written
t
t
W
S
H
= 10ms
=
= 12.0V 0.5V
t
V
V
V
V
H
CC
CC
CC
CC
= 1 s
28C64A
True Data Out
DS11109K-page 5
Data Out
Data In
I/O
I