HD26C32A HITACHI
Document overview
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Technical content
Features
- Low power dissipation with CMOS process
- Meets EIA standard RS-422A/423A
- Input sensitivity: ±0.2V (In the range of ±7 V of common mode input voltage)
- Propagation delay time: 19 ns typ
- Input hysteresis width: 60 mV typ
- Three state outputs
- Differential Inputs are includes fail safe circuit
- Power up and power down protection
- Pin to pin compatible with HD26LS32/32A
(Top view) IN A1 GND IN A2 OUT A OUT C Enable IN C2 IN C1
16 VCC
Differential Input Enable Enable Outputs VID ‡ VTH or OPEN H X H XL VTL < VID < VTH HX? XL VID ‡ VTH HXL XL XL H Z H : High level L : Low level Z : High impedance X : Irrelevant ? : Indeterminate
Absolute Maximum Ratings (Ta = 25°C) Item Symbol Ratings Unit Supply Voltage*
2 VCC 7V
Common Mode Input Voltage V CM –14 V Differential Input Voltage*3 VDIFF –14 V Enable Input Voltage V IN 7V Output Current I O –25 mA Storage Temperature Tstg –65 to +150 °C Notes: 1. The absolute maximum ratings are values which must not individually be exceeded, and furthermore, no two of which may be realized at the same time. 2. All voltage values except for differential input voltage are with respect to network ground terminal. 3. Differential input voltage is measured at the noninverting input with respect to the corresponding inverting input. Recommended Operating Conditions (Ta = –40°C to +85°C) Item Symbol Min Typ Max Unit Supply Voltage V CC 4.5 5.0 5.5 V Common Mode Input Voltage V CM —— –7V Differential Input Voltage V DIFF —— –7V Output Current I O —— –6m A Operating Temperature Topr –40 — 85 °C Enable Input Rise / Fall Time tr, tf — — 500 ns Note: 1. This item guarantees maximum limit when one input switchies. Waveform: Refer to test circuit of switching characteristics.
Electrical Characteristics (Ta = –40°C to +85°C, VCC = 5 V ± 10%) Item Symbol Min Typ Max Unit Conditions Diffrential Input VTH — — 0.2 V V CM = –7 to 7 V, VOUT ‡ 3.8 V Threshold Voltage VTL — — –0.2 V V CM = –7 to 7 V, VOUT £ 0.3 V Input Hysteresis V HYST — 60 — mV V CM = 0 V Enable Input V IH 2.0 — — V Voltage V IL — — 0.8 V Output Voltage V OH 3.8 4.2 — V V CC = 4.5 V, VDIEF = 1 V, IOUT = –6.0 mA VOL — 0.2 0.3 V V CC = 5.5 V, VDIEF = –1 V, IOUT = 6.0 mA Output Leak I OZ — 0.5 5.0 mA Enable = 0.8 V, Enable = 2.0 V VOUT = VCC CurrentI — –0.5 –5.0 mA Enable = 0.8 V, Enable = 2.0 V VOUT = GND Input Current I IN — 1.1 1.5 mA V IN = 10 V, Other Input = GND –0.1*1 — 0.6 mA V IN = 3 V, Other Input = GND 0 — –1.1 mA V IN = –3 V, Other Input = GND — –2.0 -2.5 mA V IN = –10 V, Other Input = GND Enable Input I I — — 1.0 mAV I = VCC Current — — –1.0 mAV I = GND Input Resistance R IN 5.8 6.8 10 k W VCM = –7 to 7 V (One Input AC GND) Supply Current I CC 16 23 mA V CC = 5.5 V, VDIEF = 1 V Note: 1. This specification is nonstandard of RS-422A.
Switching Characteristics (Ta = –40°C to +85°C, VCC = 5 V ± 10%) Item Symbol Min Typ Max Unit Conditions Propagation Delay Time tPLH 71 6 2 5 n s C L = 50 pF, VDIEF = 2.5 V, VCM = 0 V tPHL 71 6 2 5 n s Output Rise / Fall Time tRISE —4 9 n s C L = 50 pF, VDIEF = 2.5 V, VCM = 0 V tFALL 49n s Output Disable Time t LZ —1 32 2n s C L = 50 pF, RL = 1000 W tHZ 13 22 ns V DIEF = 2.5 V Output Enable Time t ZL —1 32 2n s C L = 50 pF, RL = 1000 W tZH 13 22 ns V DIEF = 2.5 V
- tPLH , tPHL , tRISE , tFALL Test Circuit Pulse Generater Input Output C = 50 pF L 2 V Wave forms Input + 0 V 0 V
0 V 0 V
V 10 % 90 % tr 90 % 10 % 50 % tf 2.5 V –2.5 V 2.5 V –2.5 V tPHL 50 % Input – Output
- tHZ , tZH Test Circuit Input Pulse Generater Output C = 50 pF L 2.5 V R = 1000 L Ω
2 V*1
Enable 1.3 V 1.3 V 1.3 V 1.3 V tZH OH VOL V 50 % 3 V 0 V 3 V 0 V tHZ
0.5 VOutput
- tLZ , tZL Test circuit Input Pulse Generator Output C = 50 pF L –2.5 V 2 V VCC LR = 1000 Ω Wave forms Enable 1.3 V 1.3 V 1.3 V 1.3 V tZL OH VOL V 50 % 3 V 0 V 3 V 0 V tLZ 0.5 V Output Enable Notes: 1. The pulse generator has the following characteristics: PRR = 1 MHz, 50 % duty cycle, tr £ 6 ns, tf £ 6 ns, Zout = 50 W 2. C L includes probe and jig capacitance. 3. To test Enable input, ground Enable input and apply an inverted input waveform.
HD26C32A Line Receiver Applications The HD26C32A is a line receiver that meets the EIA RS-422A and RS-423A conditions. It has a high in- phase input voltage range, both positive and negative, enabling highly reliable transmission to be performed even in noisy environments. Its main features are listed below.
- Operates on a single 5 V power supply.
- ±0.2 V input sensitivity in in-phase input voltage ±7 V range
- Three-state output
- On-chip input fail-safe circuit
- On-chip power up/down protection circuit As shown by the logic diagram, the enable function is common to all four drivers, and either active-high or active-low input can be selected. When exchange is carried out using a party line system, it is better to keep the receiver input bias current constituting the driver load small, as this allows more receivers to be connected. Output Voltage vs. Differential Input Voltage 6.0 5.0 4.0 3.0 2.0 1.0 0.0 –80 –40 0 40 80 Differential Input Voltage V DIFF (mV) Output Voltage VOUT (V) Ta = 25°C VCC = 5 V VCM = +7 V VCM = 0 V VCM = –7 V Figure 1 Differential Input Voltage vs. Output Voltage Characteristics
(reference value) DP-16 Conforms Conforms 1.07 g Unit: mm 6.30 19.20 16 9 1.3
20.00 Max
7.40 Max
7.62 0.25 + 0.13
0.51 Min
2.54 Min5.06 Max 0° – 15°
1.11 Max
(reference value) FP-16DA Conforms 0.24 g Unit: mm *Dimension including the plating thickness Base material dimension *0.22 – 0.05 *0.42 – 0.08 0.12 0.15 M
2.20 Max
5.5 10.06
0.80 Max
10.5 Max
+ 0.20 – 0.307.80 0.70 – 0.20 0° – 8° 0.10 – 0.10 1.15 1.27 0.40 – 0.06 0.20 – 0.04
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