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參數(shù)資料
| 型號(hào)： | 74LV4799PWDH-T |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類(lèi)： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16 |
| 文件頁(yè)數(shù)： | 2/18頁(yè) |
| 文件大?。?/td> | 179K |
| 代理商： | 74LV4799PWDH-T |
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Philips Semiconductors
Product specification
74LV4799
Timer for NiCd and NiMH chargers
1998 Apr 20
10
Charge discharge times
PARAMETER
TIME RANGE
CONDITIONS
Charge time
4 hours to 16 hours
Components ranges are within the values
Discharge time
15 minutes to to 4.7 hours
Components ranges are within the values
given in Section “External components range”
Self-discharge time
50 days to 100 days
given in Section External com onents range
LED frequency
The frequency of the LED output (pin1) is determined by the oscillator frequency.
Three modes of operation, each with its own frequency, are possible.
f
D
32
1
8
f
C
)
6
f
S
f
C
256
Mode
SEL
LED frequency
Charge
Trickle charge
Alarm
H or open
L
H
MOLLI pulse duration
The MOLLI output gives an output signal of four periods with a 50%
duty cycle. The duration of one period is determined by: 16/fs
Timing accuracy.
The timing accuracy depends on the accuracy of the on–chip
oscillator and on the external R and C components. The inaccuracy
of the on–chip oscillator is specified as maximum +/–7%. In most
cases the actual inaccuracy will be significantly lower. This depends
on the supply voltage as well as the value of the external
components.
Influence of Resistor value.
Low resistor values cause some spread because the RC
combination is biased by a 3–State push–pull output. The spread of
the Ron of the push–pull stage will contribute to the frequency
spread. When high–value resistors are used, any possible output
leakage of the not–selected 3–State outputs will cause a frequency
deviation. For these reasons, the resistor values must be within the
specified ranges.
Influence of supply voltage
The trip levels of the oscillator are fixed at 20% and 80% of Vcc. At
higher supply voltages the spread of the trip levels decreases in
greater proportion because the offset voltage remains constant, and
the propagation delay decreases. Furthermore, the Ron values of
the push–pull driving stage decrease at higher voltages.
SPREAD-CAUSING FACTORS
SYMBOL
PARAMETER
VCC
Tamb (°C)
UNIT
SYMBOL
PARAMETER
CC
(V)
MIN
TYP
MAX
UNIT
V ff
Offset voltage
1.0
7
mV
Voff
Offset voltage
6.0
7
mV
tP
Propagation delay
1.0
22
ms
tP
Pro agation delay
6.0
5.5
ms
RON
P-channel resistance RC RD outputs
1.0
170
W
RON
P-channel resistance RC, RD out uts
6.0
25
W
RON
N-channel resistance RC RD outputs
1.0
250
W
RON
N-channel resistance RC, RD out uts
6.0
35
W
RON
P-channel resistance RS output
1.0
1300
W
RON
P-channel resistance RS out ut
6.0
180
W
RON
N-channel resistance RS output
1.0
1300
W
RON
N-channel resistance RS out ut
6.0
180
W
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 74LV4799PW-T | 功能描述:計(jì)時(shí)器和支持產(chǎn)品 3.3V TIMER NICD AND NIMH CHARGER RoHS:否 制造商:Micrel 類(lèi)型:Standard 封裝 / 箱體:SOT-23 內(nèi)部定時(shí)器數(shù)量:1 電源電壓-最大:18 V 電源電壓-最小:2.7 V 最大功率耗散: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Reel |
| 74LV4799SD,118 | 功能描述:IC OSC TIMER CTRL 100KHZ 16SOIC RoHS:是 類(lèi)別:集成電路 (IC) >> 時(shí)鐘/計(jì)時(shí) - 可編程計(jì)時(shí)器和振蕩器 系列:74LV 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:45 系列:- 類(lèi)型:溫度 - 補(bǔ)償晶體振蕩器（TCXO） 計(jì)數(shù):- 頻率:25MHz 電源電壓:3.135 V ~ 3.465 V 電流 - 電源:1.5mA 工作溫度:-40°C ~ 85°C 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 包裝:管件 供應(yīng)商設(shè)備封裝:16-SOIC W 安裝類(lèi)型:表面貼裝 |
| 74LV540A | 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:OCTAL BUFFERS/DRIVERS WITH 3-STATE OUTPUTS |
| 74LV540APWJ | 功能描述:74LV540APW/SOT360/TSSOP20 制造商:nexperia usa inc. 系列:* 零件狀態(tài):在售 標(biāo)準(zhǔn)包裝:2,500 |
| 74LV541 | 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:Octal buffer/line driver 3-State |
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