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Part: E749BPJ
Category:
Discrete
Description: Octal Pin Electronics Driver/receiver
Company: Semtech Corporation
Datasheet: Download E749BPJ datasheet File size : 1486 kB
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Edge749 Octal Pin Electronics Driver/Receiver
EDGE HIGH-PERFORMANCE PRODUCTS Description
The Edge749 is an octal pin electronics driver and receiver combination fabricated in a high-performance C M O S process. It is designed for automatic test equipment and instrumentation where cost, functional density, and power are all at a premium. T h e Edge749 incorporates eight channels of programmable drivers and receivers into one package. Each channel has per pin driver levels, receiver threshold, and tristate control. The 18V driver output and receiver input range allows the Edge749 to interface directly between TTL, ECL, CMOS (3V, 5V, and 8V), very high voltage, and custom level circuitry. The Edge749 is pin and functionally compatible with the Edge648 and Edge649.
Features
· · · · · · · · 20 MHz Operation 18 V DUT I/O Range Programmable Output Levels Programmable Input Thresholds Per Pin Flexibility High Integration Levels Low Power Dissipation Edge 648 and 649 Compatible
Applications
· · · · · · · Burn-In ATE Functional Board Testers In-Circuit Board Testers Combinational Board Testers Low Cost Chip Testers ASIC Verifiers VXI-Based Test Equipment
Functional Block Diagram
VHIGH
VLOW
8
8
8
DATA IN
8
DVR EN*
8
DUT
8
DATA OUT
+
8
THRESHOLD
Revision 1/ June 23, 1998
1
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Edge749
EDGE HIGH-PERFORMANCE PRODUCTS PIN Description
Pin Name DATA IN (0:7) Pin Number 64, 65, 66, 67, 3, 4, 5, 6 56, 57, 58, 59, 11, 12, 13, 14 46, 43, 40, 37, 33, 30, 27, 24 60, 61, 62, 63, 7, 8, 9, 10 45, 44, 39, 38, 32, 31, 26, 25 44, 42, 41, 36, 34, 29, 28, 23 50, 51, 52, 53, 17, 18, 19, 20 21, 49 Description TTL compatible inputs that determine the high/low status of the DUT drivers. CMOS level outputs that indicate the status of the DUT receivers.
DATA OUT (0:7)
DUT (0:7)
Pin electronic inputs/outputs that receive/drive the device under test.
DVR EN (0:7)
TTl compatible inputs that control the high impedance state of the DUT drivers. Unbuffered analog inputs that set the voltage level of a logical 1 of the DUT drivers. Unbuffered analog inputs that set the voltage level of a logical 0 of the DUT drivers. Buffered analog input voltage that sets the threshold for the DUT comparators. Analog positive power supply.
VHIGH (0:7)
VLOW (0:7)
THRESHOLD (0:7)
VCC
VEE
22, 48
Analog negative power supply.
VDD
1, 15, 55
Digital power supply.
GND
2, 16, 54, 68
Device ground.
N/C
35
No connection.
2000 Semtech Corp.
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Edge749
EDGE HIGH-PERFORMANCE PRODUCTS PIN Description (continued)
THRESHOLD3
THRESHOLD2
THRESHOLD1
THRESHOLD0
DATA OUT3
DATA OUT2
DATA OUT1
DATA OUT0
DVR EN*0
VHIGH0 45
60
59
58
57
56
55
54
53
52
51
50
49
48
47
46
DVR EN*1 DVR EN*2 DVR EN*3 DATA IN0 DATA IN1 DATA IN2 DATA IN3 GND VDD GND DATA IN4 DATA IN5 DATA IN6 DATA IN7 DVR EN*4 DVR EN*5 DVR EN*6
61 62 63 64 65 66 67 68 1 2 3 4 5 6 7 8 9
10 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 11
44
VHIGH1
VLOW0
DUT0
GND
VDD
VCC
VEE
43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27
DUT1 VLOW1 VLOW2 DUT2 VHIGH2 VHIGH3 DUT3 VLOW3 NC VLOW4 DUT4 VHIGH4 VHIGH5 DUT5 VLOW5 VLOW6 DUT6
DATA OUT4
DATA OUT5
DATA OUT6
DATA OUT7
THRESHOLD4
THRESHOLD5
THRESHOLD6
THRESHOLD7
VHIGH7
DVR EN*7
2000 Semtech Corp.
3
VHIGH6
VLOW7
VEE
DUT7
GND
VDD
VCC
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Edge749
EDGE HIGH-PERFORMANCE PRODUCTS Circuit Description
Driver Description
VHIGH VLOW
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.
VHIGH
DATA IN DUT
DVR EN*
Figure 1. Driver Diagram
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). With DVR EN* high, the DUT driver goes into a high 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*
DUT
VLOW
DATA IN VHIGH VLOW
DUT
Figure 3. Simplified Model of the Unbuffered Output Stage
Figure 2. Driver Functionality
Drive Common Mode Range VEE <= DUT <= VCC
Receive Common Mode Range VEE <= DUT <= VCC
Threshold Range VEE + 3V <= THRESHOLD <= VOC - 3V
Table 1. Headroom vs. Power Supplies
2000 Semtech Corp.
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Edge749
EDGE HIGH-PERFORMANCE PRODUCTS Circuit Description (continued)
Driver Output Protection In a functional testing environment, where a resistor is added in series with the driver output (to create a 50 output impedance), the Edge749 can withstand a short to any legal DUT voltage for an indefinite amount of time. In a low impedance application with no additional output series resistance, care must be exercised and systems should be designed to check for this condition and tristate the driver if a short is detected.
Receiver Functionality E d g e 7 4 9 supports programmable thresholds per channel. There are no shared lines between comparators. THRESHOLD is a high input impedance analog input which defines a logical "1" and "0" at the DUT (see F igure 4). If the DUT voltage is more positive than THRESHOLD, DATA OUT will be high. With DUT lower than THRESHOLD, DATA OUT will be low.
DUT DATA OUT + THRESHOLD
THRESHOLD DUT
DATA OUT Tpd
F igure 4. Receiver Functionality
2000 Semtech Corp.
5
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