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TM124BBK32 Datasheet(PDF) 7 Page - Texas Instruments

Part # TM124BBK32
Description  DYNAMIC RAM MODULE
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TM124BBK32 Datasheet(HTML) 7 Page - Texas Instruments

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TM124BBK32, TM124BBK32S 1048576 BY 32-BIT
TM248CBK32, TM248CBK32S 2097152 BY 32-BIT
DYNAMIC RAM MODULE
SMMS132D – JANUARY 1991 – REVISED JUNE 1995
7
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251–1443
electrical characteristics over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted)
PARAMETER
TEST CONDITIONS
’248CBK32-60
’248CBK32-70
’248CBK32-80
UNIT
PARAMETER
TEST CONDITIONS
MIN
MAX
MIN
MAX
MIN
MAX
UNIT
VOH High-level output voltage
IOH = – 5 mA
2.4
2.4
2.4
V
VOL
Low-level output voltage
IOL = 4.2 mA
0.4
0.4
0.4
V
II
Input current (leakage)
VCC = 5 V,
VI = 0 V to 6.5 V,
All other pins = 0 V to VCC
±20
±20
±20
µA
IO
Output current (leakage)
VCC = 5.5 V,
VO = 0 V to VCC,
CAS high
±20
±20
±20
µA
ICC1
Read- or write-cycle current
(see Note 3)
VCC = 5.5 V,
Minimum cycle
856
736
656
mA
ICC2 Standby current
After 1 memory cycle,
RAS and CAS high,
VIH = 2.4 V (TTL)
32
32
32
mA
ICC2 Standby current
After 1 memory cycle,
RAS and CAS high,
VIH = VCC – 0.2 V (CMOS)
16
16
16
mA
ICC3
Average refresh current
(RAS only or CBR)
(see Note 3)
VCC = 5.5 V,
Minimum cycle,
RAS cycling,
CAS high (RAS only),
RAS low after CAS low (CBR)
1680
1440
1280
mA
ICC4
Average page current
(see Note 4)
VCC = 5.5 V,
tPC = minimum,
RAS low,
CAS cycling
736
656
576
mA
NOTES:
3. Measured with a maximum of one address change while RAS = VIL
4. Measured with a maximum of one address change while CAS = VIH
capacitance over recommended ranges of supply voltage and operating free-air temperature
f = 1 MHz (see Note 5)
’124BBK32
’248CBK32
UNIT
MIN
MAX
MIN
MAX
UNIT
Ci(A)
Input capacitance, address inputs
40
80
pF
Ci(R)
Input capacitance, RAS
28
28
pF
Ci(C)
Input capacitance, CAS
14
28
pF
Ci(W)
Input capacitance, W
56
112
pF
Co(DQ) Output capacitance on DQ pins
7
14
pF
NOTE 5: VCC = 5 V ± 0.5 V and the bias on pins under test is 0 V.
switching characteristics over recommended ranges of supply voltage and operating free-air
temperature
PARAMETER
’124BBK32-60
’248CBK32-60
’124BBK32-70
’248CBK32-70
’124BBK32-80
’248CBK32-80
UNIT
MIN
MAX
MIN
MAX
MIN
MAX
tAA
Access time from column-address
30
35
40
ns
tCAC
Access time from CAS low
15
18
20
ns
tCPA
Access time from column precharge
35
40
45
ns
tRAC
Access time from RAS low
60
70
80
ns
tCLZ
CAS to output in low Z
0
0
0
ns
tOFF
Output disable time after CAS high (see Note 6)
0
15
0
18
0
20
ns
NOTE 6: tOFF is specified when the output is no longer driven.


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