AT27C256R-55JI Atmel, AT27C256R-55JI Datasheet - Page 5

• Manufacturer Part Number: AT27C256R-55JI
• Description: IC OTP 256KBIT 55NS 32PLCC
• Manufacturer: Atmel

Specifications of AT27C256R-55JI

• Format - Memory: EPROMs
• Memory Type: OTP EPROM
• Memory Size: 256K (32K x 8)
• Speed: 55ns
• Interface: Parallel
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 32-PLCC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: AT27C256R55JI

.
9. AC Characteristics for Read Operation
Note:
10. AC Waveforms for Read Operation
Notes:
0014M–EPROM–12/07
Symbol
t
t
t
t
t
ACC
CE
OE
DF
OH
(1)
(1)
(1)
(1)
1. See AC Waveforms for Read Operation.
1. Timing measurement reference level is 1.5V for -45 devices. Input AC drive levels are V
2. OE may be delayed up to t
3. OE may be delayed up to t
4. This parameter is only sampled and is not 100% tested.
5. Output float is defined as the point when data is no longer driven.
surement reference levels for all other speed grades are V
and V
Parameter
Address to Output Delay
CE to Output Delay
OE to Output Delay
OE or CE High to Output
Float, Whichever Occurred First
Output Hold from Address, CE or OE,
Whichever Occurred First
IH
= 2.4V.
CE
ACC
- t
- t
OE
OE
after the falling edge of CE without impact on t
after the address is valid without impact on t
Condition
CE = OE = V
OE = V
CE = V
(1)
IL
IL
IL
OL
= 0.8V and V
Min
7
OH
-45
= 2.0V. Input AC drive levels are V
ACC
CE
Max
45
45
20
20
AT27C256R
.
.
IL
= 0.0V and V
Min
7
-70
AT27C256R
IH
Max
70
70
30
25
= 3.0V. Timing mea-
IL
= 0.45V
Units
ns
ns
ns
ns
ns
5