U632H16 데이터 시트보기 (PDF) - Zentrum Mikroelektronik Dresden AG
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U632H16 Datasheet PDF : 14 Pages
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U632H16
DISABELING AUTOMATIC STORES: STORE CYCLE INHIBIT and AUTOMATIC POWER UP RECALL
VCAP
5.0 V
VSWITCH AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
Po wer Up
RECA L L
24
tRESTORE
t
STORE inhibit
VCA P
1
2
3
4
5
+
6
7
100 µF 0.1 µF
8
± 20 % By pass
9
10
11
12
13
14
VSS
VCCX
28
27
26
25 HSB
24
23
22
21
20
19
18
17
16
15
Power
Su p ply
10 KΩ
(opti onal,
mandatory if HSB
is used with
external circuitry)
Figure 1: AUTOMATIC STORE OPERATION
Schematic Di agram
VCA P 1
2
3
4
5
6
7
0.1 µF
B y pass
8
9
10
11
12
13
14
VSS
28 VCCX
27
26
25 HSB
24
23
22
21
20
19
18
17
16
15
Po w er
Su pply
10 KΩ
(opti onal,
mand atory if H SB
is u sed wit h
ex ternal circ uitr y )
Figure 2: DISABELING AUTOMATIC STORES
Schematic D iagram
LOW AVERAGE ACTIVE POWER
The U632H16 has b een designed to d raw significantly1. CMOS o r TTL input levels
less po wer when Eis LOW (ch ip enabled) but the 2. the time during which t he chip is disabledH(EIGH)
access c ycle time is l o nger than 55 ns.
3. the cy cle time for acc ess es (ELOW)
When E is HIGH the chip consumes only standby cur-4. the ratio o f READs to WRITEs
rent.
5. the o perating temperature
The o verall average current drawn by the part depends6. the power supply v oltage level
on the following items :
December 12, 1997
13
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