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PDF M27C320 Data sheet ( Hoja de datos )
| Número de pieza | M27C320 | |
| Descripción | 32 Mbit 4Mb x8 or 2Mb x16 OTP EPROM | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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M27C320
32 Mbit (4Mb x8 or 2Mb x16) OTP EPROM
PRELIMINARY DATA
s 5V ± 10% SUPPLY VOLTAGE in READ
OPERATION
s FAST ACCESS TIME: 80ns
s BYTE-WIDE or WORD-WIDE
CONFIGURABLE
s 32 Mbit MASK ROM REPLACEMENT
s LOW POWER CONSUMPTION
– Active Current 70mA at 8MHz
– Stand-by Current 100mA
s PROGRAMMING VOLTAGE: 12V ± 0.25V
s PROGRAMMING TIME: 100µs/byte
(typical)(PRESTO III Algorithm)
s ELECTRONIC SIGNATURE:
– Manufacturer Code 0020h
– Device Code: 0032h
DESCRIPTION
The M27C320 is a 32 Mbit EPROM offered in the
OTP range (one time programmable). It is ideally
suited for microprocessor systems requiring large
data or program storage. It is organised as either
4 MWords of 8 bit or 2 MWords of 16 bit. The pin-
out is compatible with the 32 Mbit Mask ROM.
The M27C320 is offered in TSOP48 (12 x 20mm)
and SO44 packages.
Table 1. Signal Names
A0-A20
Address Inputs
Q0-Q7
Data Outputs
Q8-Q14
Data Outputs
Q15A–1
Data Output / Address Input
E Chip Enable
GVPP
Output Enable / Program Supply
BYTE
Byte-Wide Select
VCC Supply Voltage
VSS Ground
44
1
SO44 (M)
TSOP48 (N)
12 x 20 mm
Figure 1. Logic Diagram
VCC
21
A0-A20
E
GVPP
M27C320
Q15A–1
15
Q0-Q14
BYTE
VSS
AI02152
September 1998
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
1/15
1 page  
M27C320
Table 7. Read Mode DC Characteristics (1)
(TA = 0 to 70 °C; VCC = 5V ± 10%)
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
ICC2
IPP
VIL
Supply Current (Standby) TTL
Supply Current (Standby) CMOS
Program Current
Input Low Voltage
E = VIH
E > VCC – 0.2V
VPP = VCC
–0.3
VIH (2) Input High Voltage
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.
Max
±1
±10
70
Unit
µA
µA
mA
50 mA
1
100
10
0.8
VCC + 1
0.4
mA
µA
µA
V
V
V
V
System Considerations
The power switching characteristics of Advanced
CMOS EPROMs require carefull decoupliing 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
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 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 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 VPP
input is at 12.5V, G is at VIH and E is pulsed to VIL.
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. VCC is
specified to be 6.25V ± 0.25V.
5/15
5 Page 
M27C320
On-Board Programming
The M27C320 can be directly programmed in the
application circuit. See the relevant Application
Note AN620.
Electronic Signature
The Electronic Signature (ES) mode allows the
reading out of a binary code from an EPROM that
will identify its manufacturer and type. This mode
is intended for use by programming equipment to
automatically match the device to be programmed
with its corresponding programming algorithm.
The ES mode is functional in the 25°C ± 5°C am-
bient temperature range that is required when pro-
gramming the M27C320. To activate the ES
mode, the programming equipment must force
11.5V to 12.5V on address line A9 of the
M27C320, with VPP=VCC=5V. Two identifier bytes
may then be sequenced from the device outputs
by toggling address line A0 from VIL to VIH. All oth-
er address lines must be held at VIL during Elec-
tronic Signature mode.
Byte 0 (A0=VIL) represents the manufacturer code
and byte 1 (A0=VIH) the device identifier code. For
the STMicroelectronics M27C320, these two iden-
tifier bytes are given in Table 4 and can be read-
out on outputs Q0 to Q7.
11/15
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