DISPLAY CIRCUITS TYPES SN75497, SN75498 MOS-TO-LED 7- OR 9-CHANNEL DRIVERS e 100-mA Output Sink Current Capability e Low-Voltage Operation e MOS- and TTLCompatible Inputs e Input Threshold ... 2.7 V Max e 7 Drivers (SN75497) or 9 Drivers (SN75498) per Package e =Low-Voltage Saturating Outputs e Low Standby Power description The SN75497 and SN75498 are designed to drive common-cathode LED's in serially addressed multi-digit displays used in conjunction with MOS calculator circuits. The input of each circuit is capable of interfacing with an MOS push-pull output buffer while the output is capable of sinking the output current from a strobed LED display. These drivers are also essentially compatible with TTL inputs. They have a guaranteed threshold of 2.7 volts maximum, making them ideal for two-battery calculators or other low-voltage battery systems. They are designed to be used with active-pull-down MOS devices, but can also be used with open-drain MOS outputs with the addition of pull-down resistors on each input. The 100-mA output current capability (open collector) and low output saturation voltage makes these devices ideal for other applications such as lamp drivers, relay drivers, line drivers, high-fan-out TTL buffers, etc. The advantages over earlier digit drivers include lower operating voltage, lower output saturation voltage, lower input current, and higher input voltage range. Veco schematic (each driver) INPUT BULLETIN NO. DL-S 7712490, MAY 1977 olumns Each of is which SN75497 . .. N DUAL-IN-LINE PACKAGE der, for (TOP VIEW) aut may a worst Vec A 2a 3a 4a 5A GA TA ppose a wl fas] js] 13] 21 J 1 | 10 LJ 9 display is 4 pF. were on T7 UW VV V7 er must 5.6mA. equired I the N 1 2 3 4 5 6 7 8 iown in GND ay 2 3Y 4ay 5Y 6Y TV : at zero logic: Y =A SN75498 .. .N DUAL-IN-LINE PACKAGE IN (TOP VIEW) 3s Veo 1A 2A aA 4a 5A 6A 7A eA 9A 20 a. | s ? 6 18 4 13 12 tt s 200 V de must 1.6 mA. yYvVYVVYyYiil gr" 1 2 3 4 5 6 7 8 $ e GND WW 2yv 3Y ay sY 6Y cad BY SY logic: Y= A TO OTHER ORIVERS OUTPUT TO OTHER ORIVERS TEXAS INSTRUMENTS POST OFFICE BOX 225012 DALLAS, TEXAS 75265 3-29TYPES SN75497, SN75498 MOS-TO-LED 7- OR 9-CHANNEL DRIVERS absolute maximum ratings over operating free-air temperature range (unless otherwise noted) Supply voltage, Voc (see Note 1) Input voltage woe ee Output voltage . Continuous output collector current Ground-terminal current Continuous total dissipation over entire operating range Operating free-air temperature range Storage temperature range Lead temperature 1/16 inch from case fe for 10 seconds NOTE 1: recommended operating conditions Supply voltage, VCC High-levet input voltage, VJH Low-level input voltage, VIL Output Current, lo . Operating free-air temperature, Ta Voltage values are with respect to network ground terminal. -11Vto\ . \ 125 250 : 500 0C to 7 . 65C to 15 . 26 MIN MAX = UN 2.7 6.6 V . 27 Vee V . 8.5 0 Vv 100 m electrical characteristics over recommended free-air temperature range (unless otherwise noted) 3-30 PARAMETER TEST CONDITIONS MIN TYPT MAX | UA lOloft} _ Off-state output current Voc =66V, AatOV, Y at 6.6 V 10 100 Lu Vcc =6.6V, Aat66V thru 5000, Ig = 100mA 0.24 0.4 v On-state output volt 19 = 50 mA 0.12 0.25 Ofon) On-state output voltage Vec=27V, Aat2.7V thu 5002 - 2 Ig = 100 mA 0.24 0.4 ; Vec=66V, Aat66V, 19 = 100 mA 0.6 1 oh. . rr 1H High-level input current Vec=27V, Aat27V, 1g = 100 mA 04 . Voc=66V, Aat85V, Vo=66V -10 100 te Low-level input current iM Vec=2.7V, Aat85V, Vo=27V 100 . Vec=6.6V, One A input at 6.6 V, One driver on . 2.5 5 n lec Supply current 19 =100mA, Other A inputs at 0 V All drivers off | Vcc =6.6V, Ali inputs at OV 200 i t ail typical values are at Ta = 25C TEXAS INSTRUMENTS POST OFFICE BOX 225012 @ DALLAS, TEXAS 75265TYPES SN75497, SN75498 MOS-TO-LED 7- OR 9-CHANNEL DRIVERS olumns Each of switching characteristics, Vcc = 5 V, Ta = 25C ts which der, for PARAMETER TEST CONDITIONS MIN TYP MAX | UNIT aut may tPLH Propagation delay time, low-to-high fevel output CL=1SpF, RL=479 250 ns a worst tPHt Propagation delay time, high-to-low level output 40 ns ppose a display is 4 pF. PARAMETER MEASUREMENT INFORMATION were on er must 5.6mA. 5V equired | I the N Q | iown in BAL = 470 ' : at Zero PULSE > | GENERATOR Pourrur outPuT (See Note A) CL = 15 pF | t (See Note B) | | | - = VoL IN 3 | | | as tPHLtoo4 }of tPLH TEST CIRCUITS VOLTAGE WAVEFORMS s 200 V NOTES: A. The pulse generator has the following characteristics: Zou, = 50 2, PRR = 100 kHz, ty = t us. de must 8. Cy, includes probe and jig capacitance. FIGURE 1PROPAGATION DELAY TIMES 1.6 mA. TYPICAL CHARACTERISTICS kK also OUTPUT VOLTAGE INPUT CURRENT VS vs INPUT VOLTAGE INPUT VOLTAGE 1 TT T Vcc =6.6V Vcc =6.6V RL = 68 2 to Vec RL=682toVec Ta= 25 C 0.8 LTA = 25C 0.6 0.4 7 0.2 VA 7 0 wa {yInput CurrentmA VoOutput VoltageV 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 ViInput VoltageV V{Input VoltageV FIGURE 2 FIGURE 3 TEXAS 3-31 INSTRUMENTS POST OFFICE BOX 225012 @ DALLAS, TEXAS 75265