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参数资料
| 型号： | MAX4556ESE+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/28页 |
| 文件大小： | 0K |
| 描述： | IC SWITCH TRIPLE SPDT 16SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 功能： | 开关 |
| 电路： | 3 x SPDT |
| 导通状态电阻： | 6 欧姆 |
| 电压电源： | 单/双电源 |
| 电压 - 电源，单路/双路(±)： | 9 V ~ 40 V，±4.5 V ~ 20 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SOIC |
| 包装： | 管件 |
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MAX4554/MAX4555/MAX4556
Force-Sense Switches
______________________________________________________________________________________
19
Switching Guarded and
Force-Sense Signals
When a precision source or measurement must be con-
nected sequentially to several circuits, all sense and
guard connections must be switched simultaneously,
and at least one of the force connections must be
switched. To maintain safety and low noise levels, the
ground (or chassis) connection should never be dis-
connected.
The force circuit switch should have low-resistance,
high-current capability, but the sense and guard circuit
switches require only moderate resistance and current
capability. The sense and guard switches should have
lower leakage than the lowest measured current.
CMOS switches should also be operated from power
supplies higher than the highest circuit voltage to be
switched.
_______________Detailed Description
The MAX4554/MAX4555/MAX4556 are CMOS analog
ICs configured as force-sense switches. Each part con-
tains low-resistance switches for forcing current, and
higher resistance switches for sensing a voltage or dri-
ving guard wires. Analog signals on the force, sense, or
guard circuits can range from V- to V+. Each switch is
completely symmetrical and signals are bidirectional;
any switch terminal can be an input or output. The
switches’ open or closed states are controlled by
TTL/CMOS-compatible input (IN_) pins.
The MAX4555 and MAX4556 are characterized and
guaranteed only with ±15V supplies, but they can oper-
ate from a single supply up to +44V or non-symmetrical
supplies with a voltage totaling less than +44V. The
MAX4554 is fully characterized for operation from ±15V
supplies, and it is also fully specified for operation with
+20V and -10V supplies. A separate logic supply pin,
VL, allows operation with +5V or +3V logic, even with
unusual V+ values. The negative supply pin, V-, must
be connected to GND for single-supply operation.
The MAX4554 contains two force switches, two sense
switches, and two guard switches configured as two
3PST switches. The two switches operate independent-
ly of one another, but they have a common connection,
allowing one source to be connected simultaneously to
two loads, or two sources to be connected to one load.
An enable pin, EN, turns all switches off when driven to
logic high. The MAX4554 is also fully specified for oper-
ation with +20V and -10V supplies. The MAX4555 con-
tains four independent SPDT, NC switches; two are
force switches and two are sense switches. The
MAX4556 contains three independent SPDT switches;
one is a force switch and two are sense switches.
Switch Resistances
Each IC contains four internal switches: four low-current
sense-guard switches and two high-current force
switches. Each sense-guard switch has an on-resis-
tance of approximately 60
, while each force switch
has an on-resistance of approximately 6
. The
MAX4555’s two low-current sense-guard switches are
connected in parallel to produce lower on-resistance
and allow higher current.
Power-Supply Considerations
Overview
The MAX4554/MAX4555/MAX4556’s construction is typi-
cal of most CMOS analog switches. They have four sup-
ply pins: V+, V-, VL, and GND. V+ and V- are used to
drive the internal CMOS switches and set the analog volt-
age limits on any switch. Reverse ESD protection diodes
are internally connected between each analog and digital
signal pin and both V+ and V-. If any signal exceeds V+
or V-, one of these diodes will conduct. During normal
operation these reverse-biased ESD diodes leak, forming
the only current drawn from the signal paths.
Virtually all the analog leakage current comes through
the ESD diodes to V+ or V-. Although the ESD diodes on
a given signal pin are identical, and therefore fairly well
balanced, they are reverse biased differently. Each is
biased by either V+ or V- and the analog signal. This
means their leakages vary as the signal varies. The
dif-
ference in the two diode leakages from the signal path
to the V+ and V- pins constitutes the analog-signal-path
leakage current. All analog leakage current flows to the
supply terminals, not to the other switch terminal. This
explains how both sides of a given switch can show
leakage currents of either the same or opposite polarity.
There is no connection between the analog signal
paths and GND or VL. The analog signal paths consist
of an N-channel and P-channel MOSFET with their
sources and drains paralleled, and their gates driven
out of phase to V+ and V- by the logic-level translators.
VL and GND power the internal logic and logic-level
translator and set the input logic threshold. The logic-
level translator converts the logic levels to switched V+
and V- signals for driving the gates of the analog
switches. This drive signal is the only connection
between GND and the analog supplies. V+ and V- have
ESD-protection diodes to GND. The logic-level inputs
(IN_, and EN) have ESD protection to V+ and V-, but
not to GND; therefore, the logic signal can go below
GND (as low as V-) when bipolar supplies are used.
The logic-level threshold VIN is CMOS and TTL compat-
ible when VL is between 4.5V and 36V (see
Typical
Operating Characteristics).
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX4556ESE+ | 功能描述:模拟开关 IC Force-Sense Switch RoHS:否 制造商:Texas Instruments 开关数量:2 开关配置:SPDT 开启电阻（最大值）:0.1 Ohms 切换电压（最大）: 开启时间（最大值）: 关闭时间（最大值）: 工作电源电压:2.7 V to 4.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:DSBGA-16 |
| MAX4556ESE+T | 功能描述:模拟开关 IC Force-Sense Switch RoHS:否 制造商:Texas Instruments 开关数量:2 开关配置:SPDT 开启电阻（最大值）:0.1 Ohms 切换电压（最大）: 开启时间（最大值）: 关闭时间（最大值）: 工作电源电压:2.7 V to 4.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:DSBGA-16 |
| MAX4556ESE-T | 功能描述:模拟开关 IC RoHS:否 制造商:Texas Instruments 开关数量:2 开关配置:SPDT 开启电阻（最大值）:0.1 Ohms 切换电压（最大）: 开启时间（最大值）: 关闭时间（最大值）: 工作电源电压:2.7 V to 4.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:DSBGA-16 |
| MAX4558CEE | 功能描述:多路器开关 IC RoHS:否 制造商:Texas Instruments 通道数量:1 开关数量:4 开启电阻（最大值）:7 Ohms 开启时间（最大值）: 关闭时间（最大值）: 传播延迟时间:0.25 ns 工作电源电压:2.3 V to 3.6 V 工作电源电流: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UQFN-16 |
| MAX4558CEE+ | 功能描述:多路器开关 IC 8:1 Low Voltage Analog MUX RoHS:否 制造商:Texas Instruments 通道数量:1 开关数量:4 开启电阻（最大值）:7 Ohms 开启时间（最大值）: 关闭时间（最大值）: 传播延迟时间:0.25 ns 工作电源电压:2.3 V to 3.6 V 工作电源电流: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UQFN-16 |
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