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參數(shù)資料
| 型號： | TMS279X |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | FLOPPY DISK FORMATTERICONTROLLER FAMILY |
| 中文描述： | 軟盤驅動FORMATTERICONTROLLER家庭 |
| 文件頁數(shù)： | 37/40頁 |
| 文件大?。?/td> | 334K |
| 代理商： | TMS279X |
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TMS279X (WD279X) FLOPPY DISK FORMATTER / CONTROLLER FAMILY
37
miscellaneous timing
PARAMETER
TEST
CONDITIONS
ALT.
SYMBOL
MIN
TYP
MAX UNIT
tw(CL)
CLK low pulse duration
TCD1
230
250 20000
ns
tw(CH)
CLK high pulse duration
TCD2
230
250 20000
ns
tw(S)
STEP high pulse duration
TSTP
2 or 4
μs
tsu(DIR-S)
DIRC to STEP setup time
+ CLK error
TDIR
12
μs
tw(MRL)
MR# low pulse duration
TMR
50
μs
tw(IPL)
IP# low pulse duration
TIP
10
μs
Input
MFM
RPW
120
700
ns
tw(RW)
Read window pulse duration
0-5 V
FM +15%
240
1400
Precomp = 100 ns
MFM
WPW
200
300
400
ns
tw(WD)P
Write data pulse duration
(precompensation adjustable)
Precomp = 300 ns
MFM
WPW
600
900
1200
Cext = 0
VCO
6
MHz
f VCO
Free-running voltage-controlled
oscillator frequency
Cext = 35 pF
4
Pump up+25%
PUMP = 2.2 V Cext
= 35 pF
VCO
5
MHz
f VCO
Free-running
voltage-
controlled
oscillator
frequency
Pump down-25% PUMP = 0.2 V Cext
= 35 pF
3
VCC + 5%
Cext = 3 5 pF
3.8
4.2 MHz
f VCO
Free-running voltage-controlled
oscillator frequency
TA = 75°C
Cext = 35 pF
VCO
3.5
Cext
Adjustable external capacitor
VCO = 4 MHz
(Nom)
Cext
20
45
100
pF
VCO ÷ 8
DDEN# = 0
5/8 = 1
500
kHz
DDEN# = 0
5/8 = 0
250
f DRC
Derived read
clock frequency
VCO ÷ 16
VCO
=
4 MHz
DDEN# = 1
5/8 = 1
250
VCO ÷ 32
DDEN# = 1
5/8 = 0
RCLK
125
MFM
250
ns
tw(PUPD)
Pump up/pump down time on
(pulse duration)
FM
PU/DON
500
Symbol used in Western Digital Corporation WD 279X-02 Data Sheet.
VCO frequency adjustable by external capacitor (Cext) on pin 26.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TMS279XN | 制造商:TI 制造商全稱:Texas Instruments 功能描述:FLOPPY DISK FORMATTERICONTROLLER FAMILY |
| TMS27C/PC256-10 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:TMS27C256 32768 BY 8-BIT UV ERASABLE TMS27PC256 32768 BY 8-BIT PROGRAMMABLE READ-ONLY MEMORIES |
| TMS27C/PC256-12 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:TMS27C256 32768 BY 8-BIT UV ERASABLE TMS27PC256 32768 BY 8-BIT PROGRAMMABLE READ-ONLY MEMORIES |
| TMS27C/PC256-15 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:TMS27C256 32768 BY 8-BIT UV ERASABLE TMS27PC256 32768 BY 8-BIT PROGRAMMABLE READ-ONLY MEMORIES |
| TMS27C/PC256-17 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:TMS27C256 32768 BY 8-BIT UV ERASABLE TMS27PC256 32768 BY 8-BIT PROGRAMMABLE READ-ONLY MEMORIES |
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