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SM55161A Datasheet, PDF (26/64 Pages) Austin Semiconductor – 262144 x 16 BIT VRAM MULTIPORT VIDEO RAM
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Austin Semiconductor, Inc.
VRAM
SM55161A
Production
CAPACITANCE OVER RECOMMENDED RANGES OF SUPPLY VOLTAGE
AND OPERATING FREE-AIR TEMPERATURE*
PARAMETER
SYMBOL MIN
Input capacitance, address inputs
Ci(A)
Input capacitance, address-strobe inputs
Ci(RC)
Input capacitance, write-enable input
Ci(W)
Input capacitance, serial clock
Ci(SC)
Input capacitance, serial enable
Ci(SE)
Input capacitance, special function
Ci(DSF)
Input capacitance, transfer-register input
Ci(TRG)
Output capacitance, SQ and DQ
CO(O)
Output capacitance, QSF
CO(QSF)
TYP
MAX
UNIT
5
10
pF
8
10
pF
7
10
pF
6
10
pF
7
10
pF
7
10
pF
7
10
pF
12
15
pF
10
12
pF
NOTES: *VCC = 5V ±0.5V, and the bias on pins under test is 0V.
SWITCHING CHARACTERISTICS OVER RECOMMENDED RANGES OF
SUPPLY VOLTAGE AND OPERATING FREE-AIR TEMPERATURE1
PARAMETER
Access time from CASx\
Access time from column address
Access time from CASx\ high
Access time from RAS\
Access time of DQ from TRG\ low
Access time of SQ from SC high
Access time of SQ from SE\ low
Disable time, random output from CASx\ high3
Disable time, random output from RAS\ high3
Disable time, random output from TRG\ high3
Disable time, random output from WE\ low
Disable time, serial output from SE\ high
SYMBOL
ta(C)
ta(CA)
ta(CP)
ta(R)
ta(G)
ta(SQ)
ta(SE)
tdis(CH)
tdis(RH)
tdis(G)
tdis(WL)
tdis(SE)
CONDITIONS2
td(RLCL) = MAX
CL = 30 pF
CL = 30 pF
CL = 50 pF
CL = 50 pF
CL = 50 pF
CL = 50 pF
CL = 30 pF
-70
-75
-80
MIN MAX MIN MAX MIN MAX UNIT
17
20
20 ns
35
38
40 ns
40
43
45 ns
70
75
80 ns
17
20
20 ns
20
23
25 ns
17
18
20 ns
0 17 0 20 0 20 ns
0 17 0 20 0 20 ns
0 17 0 20 0 20 ns
0 17 0 25 0 25 ns
0 15 0 18 0 20 ns
NOTES:
1. Switching times for RAM-port output are measured with a load equivalent to one TTL load and 50pF. Data-out reference level: VOH/VOL = 2V/0.8V.
Switching times for SAM-port output are measured with a load equivalent to one TTL load and 30pF. Serial-data out reference level: VOH/VOL =
2V/0.8V.
2. For conditions shown as MIN/MAX, use the appropriate value specified in the timing requirements.
3. tdis(CH), tdis(RH), tdis(G), tdis(WL), and tdis(SE) are specified when the output is no longer driven.
SMJ55161A
Rev. 1.6 03/05
26
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
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