MX27C256QI-90 Просмотр технического описания (PDF) - Macronix International
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MX27C256QI-90 Datasheet PDF : 15 Pages
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MX27C256
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-selecting 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 0.1 uF ceramic capacitor (high frequency, low inherent
inductance) should be used on each device between
VCC and GND 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 4.7 uF bulk electrolytic capacitor should be
used between Vcc and GND for each eight devices. The
location of the capacitor should be close to where the
power supply is connected to the array.
MODE SELECT TABLE
MODE
CE
OE
Read
VIL
VIL
Output Disable
VIL
VIH
Standby (TTL)
VIH
X
Standby (CMOS)
VCC±0.3V
X
Program
VIL
VIH
Program Verify
VIH
VIL
Program Inhibit
VIH
VIH
Manufacturer Code(3)
VIL
VIL
Device Code(3)
VIL
VIL
NOTES: 1. VH = 12.0 V ± 0.5 V
2. X = Either VIH or VIL
3. A1 - A8 = A10 - A14 = VIL(For auto select)
PINS
A0
A9
VPP
OUTPUTS
X
X
VCC
DOUT
X
X
VCC
High Z
X
X
VCC
High Z
X
X
VCC
High Z
X
X
VPP
DIN
X
X
VPP
DOUT
X
X
VPP
High Z
VIL
VH
VCC
C2H
VIH
VH
VCC
10H
4. See DC Programming characteristics for VPP voltage during
programming.
P/N:PM0203
REV.5.3, SEP. 19, 2001
3
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