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2.2 TTL?????

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Title: Author: fap Last modified by: qw Created Date: 11/24/2001 9:02:01 AM Document presentation format: – PowerPoint PPT presentation

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Title: 2.2 TTL?????


1
??? ?????
2.1 ???????
2.2 TTL?????
2.3 MOS?????
2.4 ??????????
2.5 ????????????
?? ???
2
2.1 ???????
???????????? 1.????
? ? ? ? ??
VA(V) VB(V) VL(V)
0V 0V 5V 5V 0V 5V 0V 5V 0V 0V 0V 5V
3
2.????
? ? ? ? ??
VA(V) VB(V) VL(V)
0V 0V 5V 5V 0V 5V 0V 5V 0V 5V 5V 5V
4
?????????
? ? ? ?
VA(V) VL(V)
0V 5V 5V 0V
5
?????????????
(1)?????????,???????????????? (2)??????
6
???? ??????(??)???????????????
7
??DTL?????
???? (1)?A?B?C??????5V?,???D1D3???,?D4?D5?T??,?
T?????, VL0.3V,??????? (2)A?B?C??????????0.3V?,?V
P1V,???D4?D5?T???,VLVCC5V,??????? ?????????????
,?
8
2.2 TTL?????
??TTL????????????? 1.TTL????????
9
TTL????????
10
2.TTL????????
(1)???????3.6V?? T2?T3????,
??T3????,????? VOVCES30.3V
??T2????,VC21V?
T4????D????
???????? ????? ????????, ???????
11
(2)??????0.3V ??
??T4?D??,?? VOVCC-VBE4-VD
5-0.7-0.73.6(V)
??????,VB11V?T2?T3????
????RC2???,VB4VCC5V ?
????????? ??????? ???????, ???????
12
??TTL????????
1.TTL???????????? (1)??????????????????????
13
  • (2)?????????,???????,????????????

14
2.TTL?????????tpd
??????tPHL?????????????????????????????
??????tPLH?????????????????????????????
??TTL?????????tpd????????????
15
??TTL????????????????
1.???????? Vof(Vi)
16
2.??????
  • (1)???????VOH???????????1??????VOH?????3.6V,??
    ???????????VOH(min)2.4V?
  • (2)???????VOL???????????0??????VOL?????0.3V,??
    ???????????VOL(max)0.4V?
  • (3)??????VOFF?????????VOH(min)??????????????????
    ??????????????????,?VIL(max)???????VIL(max)0.8V?

17
(4)??????VON?????????VOL(max)???????????????????
?????????????????,?VIH(min)???????VIH(min)2V?
(5)????Vth??????????????????,??????????????,????
???????????? ???VthVOFFVON
?ViltVth,?????,?????
VigtVth,?????,?????? Vth??????????????Vth???1.
3V1.4V?
18
3.?????
TTL???????????????,???????
??,??????????????,??????????????,???????
  • ??????? VNLVOFF-VOL(max)0.8V-0.4V0.4V
  • ??????? VNHVOH(min)-VON2.4V-2.0V0.4V

19
1.???????IIL????????IIH(1)???????IIL???????????
????,?????????????
??TTL?????????
  • ????

????IILlt1.6mA?
20
(2)???????IIH???????????????,?????????
?????
  • ????????
  • IIHßPIB1,
  • ßP??????????????

???????? IIHßiIB1, ßi?????????????
  • ??ßp?ßi??????1,
  • ??IIH??????,????IIHlt40uA?

21
(1)???????????????,????????????
2.?????
?????????,?????,??T3????,??????????,?????????
????????????IOL,????IOL16mA??????
  • NOL??????????????

22
(2)???????????????,????????,??????????
??????,RC4??????,????????????,??????????????
???????IOH?
????IOH0.4mA? ?????
NOH??????????????
  • ??NOL?NOH,???????????????????,?NO???

23
??TTL?????7400
7400??????TTL?????,????4?2??????,??14?????????????
?
24
?? TTL????????
1.??
25
  • 2.???

26
  • 3.????

27
4.??????( OC?)
  • ??????,????????????????,??????,????????
    TTL??????????
  • ??,????????????????????????

28
OC????????????
(1)????? ?????
(2)??????? ???,?????????10V?
(3)?????? ????????????????
29
OC??????,??????RP???
  • (1)???????,
  • RP?????RP?????????????VOH(min)?

?
30
(2)???????
RP?????RP?????????????VOL(max)?
?? RP(min)ltRPltRP(max)
31
5.???
  • (1)??????????????
  • ?EN0?,G???1,D1??,???????????????,?????????
  • ?EN1?,G???0,T4?T3??????????L???,????,?????,?????

????G,?EN1?,?????, EN0?,?????
32
(2)??????
  • ????????????????????
  • (a)??????????????????

(b)??????, ????????????
33
??TTL???????????
1.74???TTL?????????,???TTL??? 2.74L??????TTL??
,??LTTL??? 3.74H?????TTL??? 4.74S??????TTL??,?
????????
74S??????? (1)?????????
34
74S??????? (1)?????????
(2)?Re2?????????? (3)???????????? (4)???????????
??
5.74LS???????????? 6.74AS??????????, 7.74ALS??
???? ????????
35
2.3 MOS?????
?? NMOS??? 1.NMOS??
  • ????(?????????VT1VT24V,?gm1gtgtgm2 )
  • (1)???Vi????8V?,T1??,T2??????gm1gtgtgm2,?????????RDS
    1ltltRDS2,?????

?????????
36
(2)???Vi????0V?,
T1??,T2??? VOVDD-VT8V VOH ,????????
???????????
2.NMOS??? (1)???
37
(2)???
38
??CMOS??
CMOS???????N??MOSFET?P??MOSFET?????
  • 1.????
  • (?VDDgt(VTNVTP),?VTNVTP)
  • (1)?Vi0V?,TN??,TP?????VOVDD?
  • (2)?ViVDD?,TN??,TP??,??VO0V?

39
2.??????
(? VDD10V, VTNVTP2V)
  • (1)?Vilt2V,TN??,TP??,VoVDD10V?

(2)?2VltVilt5V,TN??????,TP?? ???????
(3)?Vi5V,?????????, Vo(VDD/2)5V?
(4)?5VltVilt8V, TP??????, TN?????????
(5)?Vigt8V,TP??, TN??,Vo0V?
CMOS???????? VthVDD/2
40
3.????
??CMOS???????????????,?????????,?????????????
CMOS?????????????10ns?
41
?????CMOS???
1.CMOS????????? (1)???
  • (2)???

42
  • (3)????????

??????????,??????????????????
43
2.CMOS?????
?????,??????,???
???????,??????,??
44
3 .CMOS???
  • ?EN1?,TP2?TN2????,????????
  • ??,??????????????

45
  • 4 .CMOS???

????(????????VTNVTP)
46
?? CMOS?????????????
  • 1.CMOS????????
  • (1)???CMOS4000???
  • (2)???CMOSHC???
  • (3)?TTL?????CMOSHCT???
  • 2.CMOS????????????
  • (1)VOH(min)0.9VDD VOL(max)0.01VDD?
  • ??CMOS????????(???????)???
  • (2)????Vth??VDD/2?
  • (3)CMOS???????VOFF?0.45VDD,????VON?0.55VDD???,????
    ????????0.45VDD?
  • (4)CMOS???????,????1 mW/?
  • (5)?CMOS??????????,????????,??50?

47
2.4 ??????????
  • ??TTL?CMOS?????????
  • ???????????????,?????????????????????????????,?
    ???????
  • ????VOH(min)????VIH(min)
  • ????VOL(max)????VIL(max)
  • ????IOH(max)????IIH(?)
  • ????IOL(max)????IIL(?)

48
??TTL?CMOS???????????
1.??????????????????????? (a)?TTL??????????LED,??
?????????????W????????
  • (b)?TTL?????5V??????,?????D???,????????

49
2.??????
(a)???????????????????
(b)?????????????,????????
50
??????????
(1)????????,???????????????????,??????????,????
???????????
  • (2)????????,??????????,?????????????????????

51
2.5 ????????????
1.?????????????????????,????????
2.????????????????,????????
  • 3.??????????,?????????,????????

52
  • ????

1.?????????????????????????????????????
2.???????????????????,???NPN??????,??TTL????????M
OSFET??,??MOS????? 3.TTL??????????????????????
?????????,??????????????,?????????????????TTL???,?
??????????????????,?????????????
4.MOS????????????????NMOS???,????CMOS?????TTL?????
,????????,????,?????,?????TTL??,???????????????
5.?????????????,???TTL?CMOS??????????????????,???
?????????,????????????????????????
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