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MX26C4000B

4M-BIT [512K x 8] CMOS MULTIPLE-TIME-PROGRAMMABLE-EPROM

Macronix International 

READ MODE

The MX26C4000B has two control functions, both of

which must be logically satisfied in order to obtain data

at the outputs. Chip Enable (CE) is the power control

and should be used for device selection. Output Enable

(OE) is the output control and should be used to gate

data to the output pins, independent of device selection.

Assuming that addresses are stable, address access

time (tACC) is equal to the delay from CE to output (tCE).

Data is available at the outputs tOE after the falling edge

of OE, assuming that CE has been LOW and addresses

have been stable for at least tACC - tOE.

STANDBY MODE

The MX26C4000B has a CMOS standby mode which

reduces the maximum VCC current to 100 uA. It is

placed in CMOS standby when CE is at VCC ± 0.3 V.

The MX26C4000B also has a TTL-standby mode which

reduces the maximum VCC current to 1.5 mA. It is

placed in TTL-standby when CE is at VIH. When in

standby mode, the outputs are in a high-impedance

state, independent of the OE input.

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 of the eight

devices. The location of the capacitor should be close

to where the power supply is connected to the array.

OUTPUT DISABLE

Output is disabled when OE is at logre high. When in

output disabled all circuitry is enabled. Except the output

pins are in a high impedance state(Hi-Z).

P/N: PM0768

4

MX26C4000B

REV. 0.6, JAN. 14, 2002

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