E749BPJ(1998) 查看數據表（PDF） - Semtech Corporation

零件编号

产品描述 (功能)

比赛名单

E749BPJ
(Rev.:1998)

Octal Pin Electronics Driver/Receiver

Semtech Corporation 

Edge749

EDGE HIGH-PERFORMANCE PRODUCTS

Circuit Description

Driver Description

VHIGH

VLOW

DATA IN

DUT

DVR EN*

Figure 1. Driver Diagram

VHIGH and VLOW

VHIGH and VLOW define the logical “1” and “0” levels of

the DUT driver and can be adjusted anywhere over the

range determined by VCC and VEE. Table 1 documents

the relationship between the analog power to supplies

(VCC and VEE), the driver range (VHIGH and VLOW), and

the comparator threshold range (VTHRESHOLD).

The VHIGH and VLOW inputs are unbuffered in that they

also provide the driver output current (see Figure 3), so

the source of VHIGH and VLOW must have ample current

drive capability.

As shown in Figure 1, Edge749 supports programmable

high and low levels and tristate per channel. There are

no shared lines between any drivers. The DVR EN* and

DATA IN signals are TTL compatible inputs that control

the driver (see Figure 2).

VHIGH

With DVR EN* high, the DUT driver goes into a high

DUT

impedance state. With DVR EN* low, DATA IN high forces

the driver into a high state (DUT = VHIGH), and DATA IN

low forces the driver low (DUT = VLOW).

DVR EN*

DATA IN

DUT

VHIGH

VLOW

VLOW

Figure 3.

Simplified Model of the

Unbuffered Output Stage

Figure 2. Driver Functionality

Drive

Common Mode Range

VEE <= DUT <= VCC

Receive

Common Mode Range

Threshold

Range

VEE <= DUT <= VCC

VEE + 3V <= THRESHOLD <= VOC - 3V

Table 1. Headroom vs. Power Supplies

 2000 Semtech Corp.

4

www.semtech.com

Share Link: