Document
DS8925 LocalTalk Dual Driver/Triple Receiver
December 1998
DS8925 LocalTalk™ Dual Driver/Triple Receiver
General Description
The DS8925 is a dual driver/triple receiver device optimized to provide a single chip solution for a LocalTalk Interface. The device provides one differential TIA/EIA-422 driver, one TIA/EIA-423 single ended driver, one TIA/EIA-422 receiver and two TIA/EIA-423 receivers, all in a surface mount 16 pin package. This device is electrically similar to the 26LS30 and 26LS32 devices. The drivers feature ± 10V common mode range, and the differential driver provides TRI-STATEable outputs. The receivers offer ± 200 mV thresholds over the ± 10V common mode range.
Features
n n n n n n Single chip solution for LocalTalk port Two driver/three receivers per package Wide common mode range: ± 10V ± 200 mV receiver sensitivity 70 mV typical receiver input hysteresis Available in SOIC packaging
Connection Diagram
Dual-In-Line Package
Functional Diagram
DS011895-1
Order Number DS8925M See NS Package Number M16A
DS011895-2
TRI-STATE ® is a registered trademark of National Semiconductor Corporation. LocalTalk™ is a trademark of Apple Computer Incorporated.
© 1998 National Semiconductor Corporation
DS011895
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Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage (VCC) Supply Voltage (VEE) Enable Input Voltage (DEN1) Driver Input Voltage (DIN) Driver Output Voltage (Power Off: DOUT) Receiver Input Voltage (VID: RIN+ − RIN−) Receiver Input Voltage (VCM: (RIN+ + RIN−)/2) Receiver Input Voltage (Input to GND: RIN) Receiver Output Voltage (ROUT) Maximum Package Power Dissipation @ +25˚C M Package +7V −7V +7V +7V ± 15V
Derate M Package 10.6 mW/˚C above +25˚C Storage Temperature Range Lead Temperature Range (Soldering, 4 Sec.) This Device Does Not Meet 2000V ESD Rating
−65˚C to +150˚C +260˚C (Note 7)
Recommended Operating Conditions
Supply Voltage (VCC) Supply Voltage (VEE) Operating Free Air Temperature (TA) Min +4.75 −4.75 0 Typ +5.0 −5.0 25 Max +5.25 −5.25 70 Units V V ˚C
± 25V ± 25V ± 25V +5.5V
1.33W
Electrical Characteristics (Notes 2, 3) Over Supply Voltage and Operating Temperature ranges, unless otherwise specified
Symbol VOD VO VOD1 VSS ∆VOD1 VOS ∆VOS VOD2 IOZD Parameter Output Differential Voltage Output Voltage Output Differential Voltage |VOD1 − VOD1*| Output Unbalance Offset Voltage Offset Unbalance Output Differential Voltage TRI-STATE ® Leakage Current RL = 140Ω, Figure 1 VCC = 5.25V VO = +10V VEE = −5.25V VO = +6V VO = −6V VO = −10V RL = ∞ or RL = 3.9 kΩ, Figure 2 RL = 3 kΩ, Figure 2 RL = 450Ω, Figure 2 DOUT+, DOUT− 6.0 Conditions RL = ∞ or RL = 3.9 kΩ RL = ∞ or RL = 3.9 kΩ RL = 100Ω, Figure 1 Pin Min Typ Max Units V V |V| |V| 0.4 3 0.4 150 100 −100 −150 6 V V V |V| µA µA µA µA |V| |V| |V| 0.4 V V −80 DOUT+, DOUT− 80 2 1 −1 −2 −150 150 150 100 −100 −150 mA mA µA µA µA µA DIFFERENTIAL DRIVER CHARACTERISTICS
±7
4.0 8.0
± 9.0 ± 4.5
6.4 12.8 0.02 0 0.05 7.0 2 1 −1 −2
± 10 ± 5.25
SINGLE ENDED DRIVER CHARACTERISTICS VO VT ∆V T VCM IOSD IOXD Output Voltage (No Load) Output Voltage Output Unbalance Common Mode Range Short Circuit Current Power-Off Leakage Current (VCC = VEE = 0V) Power Off, or D1 Disabled VO = 0V, Sourcing Current VO = 0V, Sinking Current VO = +10V VO = +6V VO = −6V VO = −10V 4 DOUT− 3.7 3.6 4.4 4.3 4.1 0.02
DRIVER CHARACTERISTICS
± 10
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2
Electrical Characteristics (Notes 2, 3)
Symbol VTH VHY RIN IIN Parameter Input Threshold Hysteresis Input Resistance Input Current (Other Input = 0V, Power On, or VCC = VEE = 0V)
(Continued)
Over Supply Voltage and Operating Temperature ranges, unless otherwise specified Conditions −7V ≤ VCM ≤ +7V VCM = 0V −10V ≤ VCM ≤ +10V VIN = +10V VIN = +3V VIN = −3V VIN = −10V RS = 500Ω (R2 only) IOH = −400 µA, VIN = +200 mV IOH = −400 µA, VIN = OPEN IOL = 8.0 mA, VIN = −200 mV VO = 0V ROUT RIN+, RIN− Pin Min −200 6.0 0 0 Typ Max +200 Units mV mV kΩ 3.25 1.50 −1.50 −3.25 mA mA mA mA mV V V 0.5 −85 V mA V 0.8 1 −10 40 −5 40 −200 −1.5 VCC VEE 65 −15 V µA µA V mA mA RECEIVER CHARACTERISTICS
± 35
70 8.5
VIB VOH
Input Balance Test High Level Output Voltage
± 400
2.7 2.7 −15 2.0 4.2 4.2 0.3 −34
VOL IOSR VIH VIL IIH IIL VCL ICC IEE
Low Level Output Voltage Short Circuit Current High Level Input Voltage Low Level Input Voltage High Level Input Current Low Level Input Current Input Clamp Voltage Power Supply Current
DEVICE CHARACTERISTICS
VIN = 2.4V VIN = 0.4V IIN = −12 mA No Load D1 Enabled or Disabled
DIN, DEN1
3
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Switching Characteristics (Notes 4, 5) Over Supply Voltage and Operating Temperature Ranges, unless otherwise specified
Symbol tPHLD tPLHD tSKD tr tf tPHZ tPLZ tPZH tPZL tPHL tPLH tSK tr tf tPHL tPLH tSK Parameter Differential Propagation Delay High to Low Differential Propagation Delay Low to High Differential Skew |tPHLD −.