VRAM
SMJ44C251B
MT42C4256
Austin Semiconductor, Inc.
ELECTRICAL CHARACTERISTICS OVER RECOMMENDED RANGES
OF SUPPLY VOLTAGESAND OPERATING FREE-AIR TEMPERATURE
(UNLESS OTHERWISE NOTED)
PARAMETER
SYM
CONDITIONS
MIN
MAX
UNIT
High-level output voltage
VOH
IOH = -5mA
2.4
V
Low-level output voltage1
VOL
II
IOL = 4.2mA
0.4
±10
±10
V
VCC = 5V, VI = 0V to 5.8V,
All others open
Input leakage current
µA
µA
Output leakage current2
IO
VCC = 5.5V, VO = 0V to VCC
-10
-12
SAM
CONDITIONS
3
SYM
MIN MAX MIN MAX UNITS
PARAMETER
PORT
Operating current
I
t
t
and t = MIN Standby
c(W)
100
110
15
90
100
15
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
CC1
c(rd)
Operating current
I
t
= MIN
Active
Standby
Active
CC1A
c(SC)
Standby current
I
All clocks = V
CC
CC2
Standby current
I
t
= MIN
35
35
CC2A
c(SC)
RAS\-only refresh current
RAS\-only refresh current
Page-mode current
Page-mode current
CAS\-before-RAS\ current
CAS\-before-RAS\ current
Data-transfer current
Data-transfer current
I
and t = MIN Standby
c(W)
100
110
65
90
CC3
c(rd)
I
t
= MIN
Active
Standby
Active
100
60
CC3A
c(SC)
I
t
= MIN
= MIN
CC4
c(P)
I
t
70
65
CC4A
c(SC)
I
t
t
and t = MIN Standby
c(W)
90
80
CC5
c(rd)
I
t
= MIN
Active
and t = MIN Standby
c(W)
110
100
110
100
90
CC5A
c(SC)
I
CC6
c(rd)
I
t
= MIN
Active
100
CC6A
c(SC)
NOTES:
1. The SMJ44C251B may exhibit simultaneous switching noise as described in the Texas Instruments Advanced CMOS Logic Designer’s Handbook.
This phenomenon is exhibited on the DQ terminals when the SDQ terminals are switched and on the SDQ terminals when the DQ terminals are
switched. This may cause VOL and VOH to exceed the data-book limit for a short period of time, depending upon output loading and temperature. Care
should be taken to provide proper termination, decoupling, and layout of the device to minimize simultaneous switching effects.
2. SE\ is disabled for SDQ output leakage tests.
3. ICC (standby) denotes that the SAM port is inactive (standby) and the DRAM port is active (except for ICC2).
ICCA (active) denotes that the SAM port is active and the DRAM port is active (except for ICC2).
ICC is measured with no load on DQ or SDQ.
4. For conditions shown as MIN/ MAX, use the appropriate value specified in the timing requirements.
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
SMJ44C251B/MT42C4256
Rev. 0.1 12/03
17
AUSTIN [ AUSTIN SEMICONDUCTOR ]
