Datasheet > A6277SA-T

A6277SA-T

更新时间： 2024-02-23 17:21:18

品牌	Logo	应用领域
急速微 - ALLEGRO		信息通信管理光电二极管
页数	文件大小	规格书
12页	617K
描述
Display Driver, BICMOS, PDIP20

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技术参数
数据手册

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A6277SA-T 技术参数

是否Rohs认证：	符合	生命周期：	Active
包装说明：	DIP, DIP20,.3	Reach Compliance Code：	compliant
风险等级：	5.76	JESD-30 代码：	R-PDIP-T20
JESD-609代码：	e3	端子数量：	20
最高工作温度：	85 °C	最低工作温度：	-20 °C
封装主体材料：	PLASTIC/EPOXY	封装代码：	DIP
封装等效代码：	DIP20,.3	封装形状：	RECTANGULAR
封装形式：	IN-LINE	电源：	5 V
认证状态：	Not Qualified	子类别：	Display Drivers
标称供电电压：	5 V	表面贴装：	NO
技术：	BICMOS	温度等级：	OTHER
端子面层：	Matte Tin (Sn)	端子形式：	THROUGH-HOLE
端子节距：	2.54 mm	端子位置：	DUAL
Base Number Matches：	1

A6277SA-T 数据手册

6277

8-BIT SERIAL-INPUT,

CONSTANT-CURRENT

LATCHED LED DRIVER

Applications Information

The load current per bit (I_O) is set by the external resistor

(R_EXT) as shown in the figure below.

0.7 V per diode) for a group of drivers. If the available

voltage source will cause unacceptable dissipation and

series resistors or diode(s) are undesirable, a regulator

such as the Sanken Series SAI or Series SI can be used to

provide supply voltages as low as 3.3 V.

140

VCE = 0.7 V

120

100

For reference, typical LED forward voltages are:

White

Blue

Green

Yellow

Amber

Red

3.5 – 4.0 V

3.0 – 4.0 V

1.8 – 2.2 V

2.0 – 2.1 V

1.9 – 2.65 V

1.6 – 2.25 V

1.2 – 1.5 V

Infrared

Pattern Layout. This device has separate logic-ground

and power-ground terminals. If ground pattern layout

contains large common-mode resistance, and the voltage

between the system ground and the LATCH ENABLE or

CLOCK terminals exceeds 2.5 V (because of switching

noise), these devices may not operate correctly.

5 k

2 k

3 k

100

200

300

500

700

1 k

CURRENT-CONTROL RESISTANCE, R

EXT IN OHMS

Dwg. GP-061-1

Package Power Dissipation (P_D). The maximum allow-

able package power dissipation is determined as

P_D(max) = (150 - T_A)/R_θJA

The actual package power dissipation is

P_D(act) = dc(V_CE• I_O• 8) + (V_DD• I_DD).

LED

When the load supply voltage is greater than 3 V to 5 V,

considering the package power dissipating limits of these

devices, or if P_D(act) > P_D(max), an external voltage

reducer (V_DROP) should be used.

DROP

Load Supply Voltage (V_LED). These devices are de-

signed to operate with driver voltage drops (V_CE) of 0.4 V

to 0.7 V with LED forward voltages (V_F) of 1.2 V to

4.0 V. If higher voltages are dropped across the driver,

package power dissipation will be increased significantly.

To minimize package power dissipation, it is recom-

mended to use the lowest possible load supply voltage or

to set any series dropping voltage (V_DROP) as

Dwg. EP-064

V_DROP= V_LED- V_F- V_CE

with V_DROP= I_o• R_DROPfor a single driver, or a Zener

diode (V_Z), or a series string of diodes (approximately

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

1...7 8 91011 12

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型号	品牌	描述	获取价格	数据表
A6277SLW	ALLEGRO	LED Driver, 8-Segment, BICMOS, PDSO20, SOIC-20	获取价格
A6277SLW-T	ALLEGRO	暂无描述	获取价格
A6277SLWTR-T	ALLEGRO	Display Driver, BICMOS, PDSO20	获取价格
A6278	ALLEGRO	Serial-Input Constant-Current Latched LED Drivers with Open LED Detection	获取价格
A6278_07	ALLEGRO	Serial-Input Constant-Current Latched LED Drivers with Open LED Detection	获取价格
A6278EA-T	ALLEGRO	Serial-Input Constant-Current Latched LED Drivers with Open LED Detection	获取价格

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