27C160 datasheet(5/19 Pages) STMICROELECTRONICS

5 / 19 page

5/19

M27C160

Table 7. Read Mode DC Characteristics (1)

(TA =0 to 70 °C or –40to85°C; VCC = 5V ± 5% or 5V ± 10%; VPP =VCC)

Note: 1. VCC must be applied simultaneously with or before VPP and removed simultaneously or after VPP.

2. Maximum DC voltage on Output is VCC +0.5V.

Symbol

Parameter

Test Condition

Min

Max

Unit

ILI

Input Leakage Current

≤ VIN ≤ VCC

±1

µA

ILO

Output Leakage Current

≤ VOUT ≤ VCC

±10

µA

ICC

Supply Current

E =VIL,G =VIL,

IOUT = 0mA, f = 8MHz

E =VIL,G =VIL,

IOUT = 0mA, f = 5MHz

ICC1

Supply Current (Standby) TTL

E =VIH

1mA

ICC2

Supply Current (Standby) CMOS

E >VCC – 0.2V

100

µA

IPP

Program Current

VPP =VCC

µA

VIL

Input Low Voltage

–0.3

0.8

VIH

(2)

Input High Voltage

VCC +1

VOL

Output Low Voltage

IOL = 2.1mA

0.4

VOH

Output High Voltage TTL

IOH = –400µA

2.4

Standby Mode

The M27C160 has a standby mode which reduces

the active current from 50mA to 100µA. The

M27C160 is placed in the standby mode by apply-

ing a CMOS high signal to the E input. When in the

standby mode, the outputs are in a high imped-

ance state, independent of the G input.

Two Line Output Control

Because EPROMs are usually used in larger

memory arrays, this product features a 2 line con-

trol function which accommodates the use of mul-

tiple memory connection. The two line control

function allows:

a. the lowest possible memory power dissipation,

b. complete assurance that output bus contention

will not occur.

For the most efficient use of these two control

lines, E should be decoded and used as the prima-

ry device selecting function, while G should be

made a common connection to all devices in the

array and connected to the READ line from the

system control bus. This ensures that all deselect-

ed memory devices are in their low power standby

mode and that the output pins are only active

when data is required from a particular memory

device.

System Considerations

The power switching characteristics of Advanced

CMOS EPROMs require careful decoupling of the

supplies to the devices. The supply current ICC

has three segments of importance to the system

designer: the standby current, the active current

and the transient peaks that are produced by the

falling and rising edges of E.

The magnitude of the transient current peaks is

dependent on the capacitive and inductive loading

of the device outputs. The associated transient

voltage peaks can be suppressed by complying

with the two line output control and by properly se-

lected decoupling capacitors. It is recommended

that a 0.1µF ceramic capacitor is used on every

device between VCC and VSS. This should be a

high frequency type of low inherent inductance

and should be placed as close as possible to the

device. In addition, a 4.7µF electrolytic capacitor

should be used between VCC and VSS for every

eight devices.

This capacitor should be mounted near the power

supply connection point. The purpose of this ca-

pacitor is to overcome the voltage drop caused by

the inductive effects of PCB traces.

27C160 Datasheet(PDF) 5 Page - STMicroelectronics

27C160 Datasheet(HTML) 5 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

Datasheet Download

Link URL