
This feature is used by industry-standard programming equipment to select the proper programming algorithms and
voltages. The AT27BV256 programs in exactly the same way as a standard, 5V Atmel AT27C256R, and uses the same
programming equipment.
2.
Pin configurations
Pin name
A0 - A14
O0 - O7
Function
Addresses
Outputs
32-lead PLCC
Top view
CE
OE
NC
Chip enable
Output enable
No connect
A6
A5
A4
A3
A2
A1
A0
NC
O0
5
6
7
8
9
10
11
12
13
29
28
27
26
25
24
23
22
21
A8
A9
A11
NC
OE
A10
CE
O7
O6
Note:
PLCC package pins 1 and 17 are “don’t connect.”
3.
System considerations
Switching between active and standby conditions via the chip enable pin may produce transient voltage excursions. Unless
accommodated by the system design, these transients may exceed datasheet limits, resulting in device non-conformance.
At a minimum, a 0.1μF, high-frequency, low inherent inductance, ceramic capacitor should be utilized for each device. This
capacitor should be connected between the V CC and ground terminals of the device, as close to the device as possible.
Additionally, to stabilize the supply voltage level on printed circuit boards with large EPROM arrays, a 4.7μF bulk electrolytic
capacitor should be utilized, again connected between the V CC and ground terminals. This capacitor should be positioned as
close as possible to the point where the power supply is connected to the array.
Figure 3-1.
Block diagram
2
Atmel AT27BV256
0601F–EPROM–4/11