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AM27C256-120 Arkusz danych(PDF) 7 Page - Advanced Micro Devices

Numer części AM27C256-120
Szczegółowy opis  256 Kilobit (32,768 x 8-Bit) CMOS EPROM
Download  12 Pages
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Producent  AMD [Advanced Micro Devices]
Strona internetowa  http://www.amd.com
Logo AMD - Advanced Micro Devices

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AMD
2-38
Am27C256
Output OR-Tieing
To accommodate multiple memory connections, a two-
line control function is provided to allow for:
s Low memory power dissipation
s Assurance that output bus contention will not occur
It is recommended that
CE be decoded and used as the
primary device-selecting function, while
OE be made a
common connection to all devices in the array and con-
nected to the READ line from the system control bus.
This assures that all deselected memory devices are in
low-power standby mode and that the output pins are
only active when data is desired from a particular
memory device.
System Applications
During the switch between active and standby condi-
tions, 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 out-
put capacitance loading of the device. At a minimum, a
0.1-
µF 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 ef-
fects of the printed circuit board traces on EPROM ar-
rays, a 4.7-
µF bulk electrolytic capacitor should be used
between VCC and VSS for each eight devices. The loca-
tion of the capacitor should be close to where the power
supply is connected to the array.
MODE SELECT TABLE
CE
OE
A0
A9
VPP
Outputs
Read
VIL
VIL
XX
X
DOUT
Output Disable
X
VIH
X
X
X
High-Z
Standby (TTL)
VIH
X
X
X
X
High-Z
Standby (CMOS)
VCC + 0.3 V
X
X
X
X
High-Z
Program
VIL
VIH
XX
VPP
DIN
Program Verify
VIH
VIL
XX
VPP
DOUT
Program Inhibit
VIH
VIH
XX
VPP
High-Z
Manufacturer
Code
VIL
VIL
VIL
VH
X
01H
Device Code
VIL
VIL
VIH
VH
X
10H
Auto Select
(Note 3)
Mode
Pins
Notes:
1. VH = 12.0 V + 0.5 V
2. X = Either VIH or VIL
3. A1–A8 = A10–A14 = VIL
4. See DC Programming Characteristics for VPP voltage during programming.


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