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PDF Edge692 Data sheet ( Hoja de datos )
| Número de pieza | Edge692 | |
| Descripción | 200 MHz Monolithic Dual Pin Electronics Driver | |
| Fabricantes | Semtech | |
| Logotipo |  |
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EDGE HIGH-PERFORMANCE PRODUCTS
Description
Edge692
200 MHz Monolithic
Dual Pin Electronics Driver
Applications
The Edge692 is a dual pin electronics driver
manufactured in a high-performance, complementary • Memory Test Equipment
bipolar process. In Automatic Test Equipment (ATE) • Instrumentation
applications, the Edge692 offers two pin drivers suitable
for drive-only channels in memory testers, as well as for
bidirectional channels in memory, VLSI, and mixed- signal
test systems.
The Edge692 is designed to produce excellent waveforms
(low overshoot), especially at low swings (<500 mV), and
have extremely low leakage currents in HiZ mode. In
addition, the Edge692 is pin and functionally compatible
with both the Edge693 and the Bt692.
Each driver is capable of forcing 9V signals over a 12V
range, in addition to going into a high impedance state.
The driver slew rate is adjustable between 2 V/ns and 1
V/ns.
Functional Block Diagram
Each driver is completely isolated from the other. There
are separate data, enable, slew rate adjust, high and
low levels, as well as power supply inputs for each driver.
SLEWADJA
Combining two independent drivers into a 28 pin PLCC
package offers a highly integrated solution where speed
and density are at a premium.
Features
• 2 V/ns Driver Slew Rates
• Adjustable Driver Slew Rates
• Three Statable
• Low HiZ Leakage
• Low Voltage Driver Swings
• Low Overshoot Waveforms
• 12 V Output Range
• 9 V Output Swings
• 28-Pin PLCC with an Internal
Heat Spreader
• Edge693 Compatible
• Bt692 Compatible
DRVENA
DRVENA*
DHIA
DHIA*
DVHA
DVLA
BIAS
DRVENB
DRVENB*
DHIB
DHIB*
DVHB
DVLB
DRIVER A
EN
DRIVER B
EN
SLEWADJB
DOUTA
DOUTB
Revision 1 / March 31, 1998
1
www.semtech.com
1 page  
EDGE HIGH-PERFORMANCE PRODUCTS
Circuit Description (continued)
The desired value for the external resistor can be
determined from the relationship:
IBIAS = (VCC - .7) / (Rext + 50).
The actual IBIAS level is determined by selecting the
desired performance and power level. The charts listed
in the Application Information section enable the user
to quickly determine the appropriate bias level.
Thermal Monitor
The Edge692 includes an on-chip thermal monitor
accessible through the THERMAL DIODE pin. This node
connects to 5 diodes in series to VEE (see Figure 2) and
may be used to accurately measure the junction
temperature at any time.
Slew Rate Adjustment
The driver rising and falling slew rates are adjustable
from 2 V/ns to 1 V/ns. The actual slew rate realized is a
function of the chip bias and slew rate adjust input
currents.
The SLEWADJ input is determined by selecting the
desired performance and power level (after the BIAS
current is first chosen.) The charts listed in the
Application Information section enable the user to quickly
determine the appropriate SLEWADJ level.
SLEWADJ is a current controlled input that varies the
rising and falling edge slew rates. Ideally, a current DAC
would be used to establish this current. However, a
resistor to a positive voltage, typically VCC, is acceptable.
Thermal Diode
Bias Current
Figure 3 shows a simplified schematic of the SLEWADJ
input stage. Once a desired input current is selected,
the external resistor value is determined by the following
relationship:
˚Temperature coefficient = –10 mV/ C
(VCC - .7) / (Rext + 860) = Islewadj.
VCC
SLEWADJ
REXT
VEE
Figure 2. Thermal Diode String
1.72K
1.72K
A bias current of 100 µA is injected into this node, and
the measured voltage corresponds to a specific junction
temperature with the following equation:
TJ(˚C) = {[(VTHERMAL DIODE – VEE) / 5] – .7} / (–.00208).
Iradj Ifadj
Figure 3. SLEWADJ input circuitry
Notice that the driver A slew rate and driver B slew rate
are independent. However, the rising and falling edge
slew rates on each driver track each other and are not
independent.
2000 Semtech Corp.
5 www.semtech.com
5 Page 
EDGE HIGH-PERFORMANCE PRODUCTS
Application Information (continued)
Thermal Information
Parameter
Thermal Resistance
Junction to Case
Junction to Air
Still Air
50 LFPM
400 LFPM
Symbol
θJC
θJA
θJA
θJA
Min
Typ Max Units
13 oC/W
49 oC/W
36 oC/W
26 oC/W
2000 Semtech Corp.
11 www.semtech.com
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet Edge692.PDF ] | |
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