M27C320 Datasheet, PDF (5/15 Pages) STMicroelectronics – 32 Mbit 4Mb x8 or 2Mb x16 OTP EPROM

M27C320
Table 7. Read Mode DC Characteristics ⁽¹⁾
(T_A = 0 to 70 °C; V_CC = 5V ± 10%)
Symbol
Parameter
Test Condition
Min
I_LI
Input Leakage Current
I_LO Output Leakage Current
I_CC Supply Current
0V ≤ V_IN ≤ V_CC
0V ≤ V_OUT ≤ V_CC
E = V_IL, G = V_IL, I_OUT = 0mA,
f = 8MHz
E = V_IL, G = V_IL, I_OUT = 0mA,
f = 5MHz
I_CC1
I_CC2
I_PP
V_IL
Supply Current (Standby) TTL
Supply Current (Standby) CMOS
Program Current
Input Low Voltage
E = V_IH
E > V_CC – 0.2V
V_PP = V_CC
–0.3
V_IH ⁽²⁾ Input High Voltage
2
V_OL Output Low Voltage
I_OL = 2.1mA
V_OH Output High Voltage TTL
I_OH = –400µA
2.4
Note: 1. V_CC must be applied simultaneously with or before V_PP and removed simultaneously or after V_PP.
2. Maximum DC voltage on Output is V_CC +0.5V.
Max Unit
±1
µA
±10
µA
70
mA
50
mA
1
mA
100
µA
10
µA
0.8
V
V_CC + 1
V
0.4
V
V
System Considerations
The power switching characteristics of Advanced
CMOS EPROMs require carefull decoupliing of
the supplies to the devices. The supply current I_CC
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
dependant on the capacititive and inductive load-
ing of the device outputs. The associated transient
voltage peaks can be supressed 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 V_CC and V_SS. 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 V_CC and V_SS for every
eight devices. This capacitor should be mounted
near the power supply connection point. The pur-
pose of this capacitor is to overcome the voltage
drop caused by the inductive effects of PCB trac-
es.
Programming
When delivered, all bits of the M27C320 are in the
’1’ state. Data is introduced by selectively pro-
gramming ’0’s into the desired bit locations. Al-
though only ’0’s will be programmed, both ’1’s and
’0’s can be present in the data word. The
M27C320 is in the programming mode when V_PP
input is at 12.5V, G is at V_IH and E is pulsed to V_IL.
The data to be programmed is applied to 16 bits in
parallel to the data output pins. The levels required
for the address and data inputs are TTL. V_CC is
specified to be 6.25V ± 0.25V.
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