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參數(shù)資料
| 型號： | MAX975ESA+ |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 3/17頁 |
| 文件大小： | 0K |
| 描述： | IC COMPARATOR SNGL 3V/5V 8-SOIC |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 100 |
| 類型： | 通用 |
| 元件數(shù)： | 1 |
| 輸出類型： | CMOS，滿擺幅，TTL |
| 電壓 - 電源，單路/雙路(±)： | 2.7 V ~ 5.25 V |
| 電壓 - 輸入偏移（最小值）： | 2mV @ 5V |
| 電流 - 輸入偏壓（最小值）： | 0.1µA @ 5.25V |
| 電流 - 靜態(tài)（最大值）： | 500µA |
| CMRR, PSRR（標(biāo)準(zhǔn)）： | 90dB CMRR，90dB PSRR |
| 傳輸延遲（最大）： | 820ns |
| 磁滯： | 4mV |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 安裝類型： | 表面貼裝 |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁面： | 1386 (CN2011-ZH PDF) |
_______________Detailed Description
The MAX975/MAX977 single/dual comparators have
three operating modes, and use a +2.7V to +5.25V
single supply. The operating modes are as follows:
high speed, high speed with auto-standby, and low
power. Propagation delay is typically 28ns in high-
speed mode, while typical supply current is 250A. In
low-power mode, propagation delay is typically 480ns
and power consumption is only 3A. The auto-standby
feature switches into low-power standby for each
comparator with unchanging outputs in high-speed
mode. The timeout period, or the time that OUT_
must be idle (unchanged state) for the MAX975/
MAX977 to enter auto-standby, is adjustable by means
of an external capacitor. All inputs and outputs can tol-
erate a continuous short-circuit fault condition to either
rail. Internal hysteresis in high-speed mode ensures
clean output switching, even with slow-moving input
signals.
The MAX975 functional diagram shows two paralleled
comparators, a timing circuit, a transition detector, and
logic gates. The upper comparator is high speed, while
the lower comparator is a slower low-power compara-
tor. The dual MAX977 features independent timeout
adjustment. The following sections discuss the details
of operation.
Hysteresis (High-Speed Mode Only)
Most high-speed comparators can oscillate in the linear
operating region because of noise or undesired para-
sitic feedback. This tends to occur when the voltage on
one input is equal to or very close to the voltage on the
other input. The MAX975/MAX977 have internal hys-
teresis to counter parasitic effects and noise.
The hysteresis in a comparator creates two trip points:
one for the rising input voltage and one for the falling
input voltage (Figure 1). The difference between the trip
points is the hysteresis. When the comparators’ input
voltages are equal, the hysteresis effectively causes
one comparator input voltage to move quickly past the
other, taking the input out of the region where oscilla-
tion occurs.
Figure 1 illustrates the case where IN- has a fixed volt-
age applied and IN+ is varied. If the inputs were
reversed, the figure would be the same, except with an
inverted output.
Auto-Standby Mode
The MAX975/MAX977’s auto-standby function operates
only in high-speed mode. The device enters auto-
standby when OUT_ remains unchanged for a prepro-
grammed timeout period. In auto-standby mode, the
low-power comparator is enabled while the high-speed
comparator is disabled and STAT_ goes high. The logic
state and sink/source capabilities of OUT_ remain
unchanged, but propagation delay increases to 480ns.
In this mode, the timing circuitry is powered down, and
the transition detector monitors the low-power com-
parator for a transition. When an output transition
occurs (OUT_ changes state), the timing circuitry is
MAX975/MAX977
Single/Dual, +3V/+5V Dual-Speed
Comparators with Auto-Standby
______________________________________________________________________________________
11
INPUTS
LP
STO_
IDLE TIME
MODE
STAT
OUTPUT
L
tASB = CSTO x 10s/pF
<tASB
High speed
(Auto-standby enabled)
L
tASB = CSTO x 10s/pF
≥tASB
Auto-standby
H
↓
(falling edge)
L
X
High speed
(Auto-standby mode disabled)
L
H
X
Low power
H
Table 1. Programming
VOL
VOH
VIN- = 0
VOS =
VTRIP+ + VTRIP-
2
COMPARATOR
OUTPUT
VTRIP+
VIN+
VHYST
VTRIP-
Figure 1. Input and Output Waveforms, Noninverting Input
Varied
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| MAX975ESA+ | 功能描述:校驗(yàn)器 IC 3V/5V Dual Speed Comparator RoHS:否 制造商:STMicroelectronics 產(chǎn)品: 比較器類型: 通道數(shù)量: 輸出類型:Push-Pull 電源電壓-最大:5.5 V 電源電壓-最小:1.1 V 補(bǔ)償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應(yīng)時間: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel |
| MAX975ESA+T | 功能描述:校驗(yàn)器 IC 3V/5V Dual Speed Comparator RoHS:否 制造商:STMicroelectronics 產(chǎn)品: 比較器類型: 通道數(shù)量: 輸出類型:Push-Pull 電源電壓-最大:5.5 V 電源電壓-最小:1.1 V 補(bǔ)償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應(yīng)時間: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel |
| MAX975ESA-T | 功能描述:校驗(yàn)器 IC 3V/5V Dual Speed Comparator RoHS:否 制造商:STMicroelectronics 產(chǎn)品: 比較器類型: 通道數(shù)量: 輸出類型:Push-Pull 電源電壓-最大:5.5 V 電源電壓-最小:1.1 V 補(bǔ)償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應(yīng)時間: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel |
| MAX975EUA | 功能描述:校驗(yàn)器 IC 3V/5V Dual Speed Comparator RoHS:否 制造商:STMicroelectronics 產(chǎn)品: 比較器類型: 通道數(shù)量: 輸出類型:Push-Pull 電源電壓-最大:5.5 V 電源電壓-最小:1.1 V 補(bǔ)償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應(yīng)時間: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel |
| MAX975EUA+ | 功能描述:校驗(yàn)器 IC 3V/5V Dual Speed Comparator RoHS:否 制造商:STMicroelectronics 產(chǎn)品: 比較器類型: 通道數(shù)量: 輸出類型:Push-Pull 電源電壓-最大:5.5 V 電源電壓-最小:1.1 V 補(bǔ)償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應(yīng)時間: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel |
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