UVEPROM
AS27C256A
Au stin Sem icon du ctor, In c.
ABSOLUTE MAXIMUM RATINGS*
Supply Voltage Range, VCC**...........................-0.6V to +7.0V
Supply Voltage Range, Vpp**...............................-0.6V to +13.5V
*Stresses greater than those listed under "Absolute Maximum
Ratings" may cause permanent damage to the device. This is
a stress rating only and functional operation of the device at
these or any other conditions above those indicated in the op-
Input Voltage Range, All inputs except A9**..-0.6V to +6.0V
A9.....-0.6V to +13.5V
Output Voltage Range**...............................-0.6V to VCC +.6V
eration section of this specification is not implied.
Expo-
sure to absolute maximum rating conditions for extended peri-
ods may affect reliability.
Minimum Operating Free-air Temperature, TA..............-55°C
Maximum Operating Case Temperature, TC...................125°C
Storage Temperature Range, Tstg.....................-65°C to 150°C
** All voltage values are with respect to GND.
RECOMMENDED OPERATING CONDITIONS
MIN
4.5
6
TYP
5
MAX
5.5
Read Mode1
VCC
VPP
Supply Voltage
Supply Voltage
FLASHRITE Pulse programming algorithm
Read Mode2
6.25
6.5
VCC-0.6
13
FLASHRITE Pulse programming algorithm
12.5
2.2
12.75
TTL inputs
VCC+.6
VIH
VIL
High-level input voltage
Low-level input voltage
CMOS inputs VCC-0.2
VCC+.6
TTL inputs
CMOS inputs
-0.5
-0.5
0.8
0.2
Voltage level on A9 for signature mode
Operating free-air temperature
Operating case temperature
VID
TA
11.5
-55
12
12.5
TC
+125
NOTES:
1. VCC must be applied before or at the same time as VPP and removed after or at the same time as VPP. The deivce must not be inserted into or removed from
the board when VPP or VCC is applied.
2. VPP can be connected to VCC directly (except in the program mode). VCC supply current in this case would be ICC2 + IPP1
.
ELECTRICAL CHARACTERISTICS OVER RECOMMENDED RANGES OF SUPPLY VOLTAGE AND
OPERATING FREE-AIR TEMPERATURE
PARAMETER
TYP1
TEST CONDITIONS
IOH = -400µA
MIN
MAX
UNIT
High-level output voltage
2.4
V
VOH
VOL
II
Low-level output voltage
Input current (leakage)
Output current (leakage)
VPP supply current
0.4
1
V
IOL = 2.1mA
µA
µA
µA
mA
mA
µA
VI = 0V to 5.5V
VO = 0V to VCC
VPP = VCC = 5.5V
VPP = 13V
5
IO
100
50
1
IPP1
IPP2
PP supply current (during program pulse)2
30
15
V
TTL-Input Level
V
CC = 5.5V, E\=VIH
CC = 5.5V, E\=VCC
ICC1
VCC supply current (standby)
VCC supply current (active)
CMOS-Input Level
300
V
'27C256-12
'27C256-15
'27C256-17
'27C256-20,-25
E\=VIL, VCC=5.5V
ICC2
25
mA
tcycle = minimum, outputs
open
NOTES:
1. Typical values are at TA=25°C and nominal voltages.
2. This parameter has been characterized at 25°C and is not tested.
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
AS27C256A
Rev. 1.1 6/ 05
6
MICROSS [ MICROSS COMPONENTS ]
