M27C400-70B1TR Datasheet PDF - STMicroelectronics
| Part Number | M27C400-70B1TR | |
| Description | 4 Mbit 512Kb x8 or 256Kb x16 UV EPROM and OTP EPROM | |
| Manufacturers | STMicroelectronics | |
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M27C400
4 Mbit (512Kb x8 or 256Kb x16) UV EPROM and OTP EPROM
s 5V ± 10% SUPPLY VOLTAGE in READ
OPERATION
s ACCESS TIME: 55ns
s BYTE-WIDE or WORD-WIDE
CONFIGURABLE
s 4 Mbit MASK ROM REPLACEMENT
s LOW POWER CONSUMPTION
– Active Current 70mA at 8MHz
– Stand-by Current 100µA
s PROGRAMMING VOLTAGE: 12.5V ± 0.25V
s PROGRAMMING TIME: 100µs/word
s ELECTRONIC SIGNATURE
– Manufacturer Code: 20h
– Device Code: B8h
DESCRIPTION
The M27C400 is an 4 Mbit EPROM offered in the
two ranges UV (ultra violet erase) and OTP (one
time programmable). It is ideally suited for micro-
processor systems requiring large data or program
storage. It is organised as either 512 Kwords of 8
bit or 256 Kwords of 16 bit. The pin-out is compat-
ible with the most common 8 Mbit Mask ROM.
The FDIP40W (window ceramic frit-seal package)
has a transparent lid which allows the user to ex-
pose the chip to ultraviolet light to erase the bit pat-
tern.
A new pattern can then be written rapidly to the de-
vice by following the programming procedure.
For applications where the content is programmed
only one time and erasure is not required, the
M27C400 is offered in PDIP40 package.
40
1
FDIP40W (F)
40
1
PDIP40 (B)
Figure 1. Logic Diagram
VCC
18
A0-A17
E
G
BYTEVPP
M27C400
Q15A–1
15
Q0-Q14
VSS
AI01634
May 1999
1/14
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Table 7. Read Mode DC Characteristics (1)
(TA = 0 to 70 °C or –40 to 85 °C; VCC = 5V ± 5% or 5V ± 10%; VPP = VCC)
Symbol
Parameter
Test Condition
Min
ILI Input Leakage Current
ILO Output Leakage Current
ICC Supply Current
0V ≤ VIN ≤ VCC
0V ≤ VOUT ≤ VCC
E = VIL, G = VIL,
IOUT = 0mA, f = 8MHz
E = VIL, G = VIL,
IOUT = 0mA, f = 5MHz
ICC1 Supply Current (Standby) TTL
ICC2 Supply Current (Standby) CMOS
IPP Program Current
E = VIH
E > VCC – 0.2V
VPP = VCC
VIL
VIH (2)
Input Low Voltage
Input High Voltage
–0.3
2
VOL Output Low Voltage
IOL = 2.1mA
VOH Output High Voltage TTL
IOH = –400µA
2.4
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.
M27C400
Max
±1
±10
Unit
µA
µA
70 mA
50
1
100
10
0.8
VCC + 1
0.4
mA
mA
µA
µA
V
V
V
V
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 ca-
pacitive and inductive loading of the device out-
puts. The associated transient voltage peaks can
be suppressed by complying with the two line out-
put control and by properly selected decoupling
capacitors. It is recommended that a 0.1µF ceram-
ic 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 be-
tween VCC and VSS for every eight devices. This
capacitor should be mounted near the power sup-
ply connection point. The purpose of this capacitor
is to overcome the voltage drop caused by the in-
ductive effects of PCB traces.
Programming
When delivered (and after each erasure for UV
EPROM), all bits of the M27C400 are in the '1'
state. Data is introduced by selectively program-
ming '0's into the desired bit locations. Although
only '0's will be programmed, both '1's and '0's can
be present in the data word. The only way to
change a '0' to a '1' is by die exposition to ultravio-
let light (UVEPROM). The M27C400 is in the pro-
gramming mode when VPP input is at 12.5V, G is
at VIH and E is pulsed to VIL. The data to be pro-
grammed is applied to 16 bits in parallel to the data
output pins. The levels required for the address
and data inputs are TTL. VCC is specified to be
6.25V ± 0.25V.
5/14
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