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Part: E818AHF
Category:
Analog & Mixed-Signal Processing
Description: Octal 18v Pin Electronics Driver/window Comparator
Company: Semtech Corporation
Datasheet: Download E818AHF datasheet File size : 60 kB
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Edge818 Octal 18V Pin Electronics Driver/window Comparator
EDGE HIGH-PERFORMANCE PRODUCTS Description
The Edge818 is an octal pin electronics driver and window comparator fabricated in a wide voltage CMOS process. It is designed specifically for Test During Burn In (TDBI) applications, where cost, functional density, and power are all at a premium. T h e Edge818 incorporates eight channels of programmable drivers and window comparators into one 14 mm X 20 mm 100 pin MQFP package. Each channel has per pin driver levels, data, and high impedance control. In addition, each comparator has per pin high and low threshold levels. The Edge818 uses "Flex In" and "Flex Out" digital inputs, and can therefore mate directly with any digital technology providing a minimum 2V swing. The digital outputs can mate directly with any digital technology. The 18V driver output and receiver input range allow the Edge818 to interface directly with TTL, ECL, CMOS (3V, 5V, and 7V), LVCMOS, and custom level circuitry, as well as the high voltage (Super Voltage) level required for many special test modes for Flash Devices.
Features
· · · · · · · 18V I/O Range 50 MHz Operation Per Pin Flexibility Programmable Input Thresholds Flex In Digital Inputs Flex Out Digital Outputs Small footprint (100 pin MQFP)
Applications
· Burn In ATE · Low Cost ATE · Instrumentation
Functional Block Diagram
+
VH VL
DATA EN*
8 8
8
DOUT
QA COMP HIGH COMP LOW QB
8
+
8
CVA
8
VINP
8
8 CVB
Revision 1/ May 23, 2000
1
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Edge818
EDGE HIGH-PERFORMANCE PRODUCTS PIN Description
Pin Name DATA (0:7) Pin Number 100, 4, 8, 12, 19, 23, 27, 31 Description Digital inputs which determine the high/low state of the driver, when it is enabled. Digital inputs wihch enable/disable the driver. Comparator digital outputs.
EN* (0:7) QA (0:7) QB (0:7) DOUT (0:7)
3, 7, 11, 15, 16, 20, 24, 28 1, 5, 9, 13, 18, 22, 26, 30 2, 6, 10, 14, 17, 21, 25, 29 79, 75, 71, 67, 64, 60, 56, 52
Driver Outputs.
VINP (0:7) VH (0:7)
81, 77, 73, 69, 62, 58, 54, 50 80, 76, 72, 68, 63, 59, 55, 51
Comparator Inputs. Unbuffered analog inputs that set the driver "high" voltage level. Unbuffered analog inputs that set the driver "low" voltage level. Analog inputs that set the threshold for the A comparators.
VL (0:7)
78, 74, 70, 66, 65, 61, 57, 53
CVA (0:7)
97, 95, 89, 87, 44, 42, 36, 34
CVB (0:7) VBB
96, 94, 88, 86, 45, 43, 37, 35 46, 85
Analog inputs that set the threshold for the B comparators. Analog input voltage that sets the threshold for the digital inputs. Unbuffered analog input that sets the high level of the comparator outputs. Unbuffered analog input that sets the low level of the comparator outputs. Positive power supply.
COMP HIGH
33, 98
COMP LOW
32, 99
VCC
40, 41, 47, 49, 82, 84, 90, 91
VEE
38, 39, 48, 83, 92, 93
Negative power supply.
2000 Semtech Corp.
2
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Edge818
EDGE HIGH-PERFORMANCE PRODUCTS PIN Description (continued)
COMP HIGH
COMP LOW
DATA0
81 QA0 QB0 EN*0 DATA1 QA1 QB1 EN*1 DATA2 QA2 QB2 EN*2 DATA3 QA3 QB3 EN*3 EN*4 QB4 QA4 DATA4 EN*5 QB5 QA5 DATA5 EN*6 QB6 QA6 DATA6 EN*7 QB7 QA7 31 51 1 VH0 DOUT0 VL0 VINP1 VH1 DOUT1 VL1 VINP2 VH2 DOUT2 VL2 VINP3 VH3 DOUT3 VL3 VL4 DOUT4 VH4 VINP4 VL5 DOUT5 VH5 VINP5 VL6 DOUT6 VH6 VINP6 VL7 DOUT7 VH7
100 Lead - 14 x 20 MQFP
DATA7
VEE
COMP LOW
VEE
VBB
CVA7
CVA6
CVA5
COMP HIGH
CVB7
CVB6
CVB5
CVA4
VCC
VCC
CVB4
VCC
VEE
VCC
2000 Semtech Corp.
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VINP7
VINP0
CVB0
CVB1
CVB2
CVB3
CVA0
CVA1
CVA2
CVA3
VCC
VCC
VCC
VCC
VEE
VEE
VBB
VEE
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Edge818
EDGE HIGH-PERFORMANCE PRODUCTS Circuit Description
Driver Description The Edge818 supports programmable high and low levels and tristate per channel. There are no shared lines between any drivers. The EN* and DATA signals are wide voltage high impedance analog inputs capable of receiving digital signals over a wide common mode range. VBB is the high impedance analog input which sets the threshold for EN* and DATA. EN*, DATA > VBB < VBB Status "1" "0"
VL VH
DUT
F igure 3. Simplified Model of the Unbuffered Output Stage
With EN* high, the driver goes into a high impedance state. With EN* low, DATA high forces the driver into a high state, and DATA low forces the driver into a low state. EN* 1 0 0 DATA X 1 0 DOUT HiZ VH VL
Driver Output Protection In a functional testing environment, where a resistor is added in series with the driver output to create a 50 driver, the Edge818 can withstand a short to any legal voltage for an indefinite amount of time. In a low impedance application, with no additional output resistance, the system should be designed to check for a short circuit prior to connecting the driver, and tristate the driver if a short is detected.
Drive High and Low VH and VL define the logical "1" and "0" levels of the driver, and can be adjusted anywhere over the range determined by VCC and VEE. There are no restrictions between VH and VL, other than they must remain within the power supply levels. VEE VH VCC VEE VL VCC The VH and VL inputs are unbuffered in that they also provide the driver output current (see Figure 3), so the source of VH and VL must have ample current drive capability.
Receiver Description T h e Edge818 supports a window comparator with independent threshold levels per channel. There are no shared comparator lines between channels. CVA and CVB are high impedance analog voltage inputs which define the threshold voltages for comparators A and B. If VINP is more positive than CVA or CVB, QA and QB will be high. Otherwise, QA and QB will be low. VINP VINP > CVA VINP CVB VINP < CVB QA COMP HIGH COMP LOW QB COMP HIGH COMP LOW
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2000 Semtech Corp.
4
Edge818
EDGE HIGH-PERFORMANCE PRODUCTS Circuit Description (continued)
The comparator outputs are "Flex Out". They are technology independent and may be adjusted over a wide voltage common mode range. COMP HIGH and COMP LOW are analog inputs which set the digital high and low levels (respectively) of QA and QB. COMP HIGH and COMP LOW are unbuffered inputs that provide the necessar y drive current, so the sources for these levels must have adequate current capability.
COMP HIGH
QAX, QBX
COMP LOW
F igure 4. Simplified Model of the Unbuffered Comparator Output Stage
Typically, COMP HIGH and COMP LOW will be connected to the digital power supplies of the chip receiving QA and QB. Receiver Headroom T h e r e is ~2V of headroom required between the comparator thresholds and both power supply levels. VEE + 2.0 CVA, CVB VCC 2.0
2000 Semtech Corp.
5
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