TSM921 TOUCHSTONE [Touchstone Semiconductor Inc], TSM921 Datasheet
TSM921
Related parts for TSM921
TSM921 Summary of contents
Page 1
... TSM921–TSM924 family can operate from single +2.5V to +11V supplies or from ±1.25V to ±5.5V dual supplies. The single TSM921 and the dual TSM922 draw less than 4μA (max) supply current over temperature. The dual TSM923 and the quad TSM924 draw less than 2.5μA per comparator over temperature ...
Page 2
... IN-)..............................................(V+ + 0.3V) to (V- - 0.3V) HYST…………………………………….(REF + 5V) to (V- - 0.3V) Output Voltage REF..................................................... (V+ + 0.3V) to (V- - 0.3V) OUT (TSM921/24)...........................(V+ + 0.3V) to (GND - 0.3V) OUT (TSM922/23)...............................(V+ + 0.3V) to (V- - 0.3V) Input Current (IN+, IN-, HYST)..............................................20mA Output Current REF…………………………………………………………….20mA OUT… ...
Page 3
... CARRIER QUANTITY ORDER NUMBER MARKING TSM922CUA+ Tube TABC Tape TSM922CUA+T & Reel PART ORDER NUMBER CARRIER QUANTITY ORDER NUMBER MARKING TSM923CUA+ Tube TABA Tape TSM923CUA+T & Reel TSM921_24DS r1p0 TSM921-TSM924 PART MARKING TSM922CSA+ 50 TS922 TSM922CSA+T TSM922ESA+ 2500 TS922E TSM922ESA+T PART MARKING TSM923CSA+ 50 TS923 TSM923CSA+T ...
Page 4
... TSM924CSE+T & Reel Lead-free Program: Touchstone Semiconductor supplies only lead-free packaging. Consult Touchstone Semiconductor for products specified with wider operating temperature ranges. Page 4 ORDER PART NUMBER MARKING 48 TSM924ESE+ TS924E 2500 TSM924ESE+T CARRIER QUANTITY Tube 48 Tape 2500 & Reel TSM921_24DS r1p0 RTFDS ...
Page 5
... Output High Voltage T A TSM922, TSM923 Output Low Voltage TSM921, TSM924 REFERENCE T A Reference Voltage T A Source Current Sink Current Voltage Noise 100Hz to 100kHz TSM921_24DS r1p0 TSM921 +25°C A HYST = REF T = -40°C to +85° +25°C A TSM922 T = -40°C to +85°C A ...
Page 6
... V- 0.2 0.1 20 REF- 0.05V – 0.4 = 0.8mA V- + 0.4 = 0.8mA GND + 0.4 1.170 1.182 1.194 1.158 1.206 100 = are guaranteed by A MIN MAX ” section. TSM921_24DS r1p0 UNITS 3.0 3.8 3.0 3.8 μA 4.3 6 6.2 8.0 ±10 mV ± mV/V 1 mV/V μV RMS REF V μ μA μA μ ...
Page 7
... Reference Output Voltage vs Output Load Current 1.190 SINK 1.185 1.180 1.175 1.170 SOURCE 1.165 1.160 1.155 LOAD CURRENT - µA TSM921 Supply Current vs Temperature 4.5 IN+ = IN- + 100mV 5V - 1.5 -40 - TEMPERATURE - ºC TSM921_24DS r1p0 5 4 ...
Page 8
... IN+ = IN- + 100mV -40 - TEMPERATURE - ºC Hysteresis Control OUTPUT HIGH NO CHANGE OUTPUT LOW REF HYST Response Time vs Load Capacitance OHL V OLH 100 LOAD CAPACITANCE - nF TSM921_24DS r1p0 RTFDS ...
Page 9
... OVERDRIVE 1 1.5 2 SINGLE-SUPPLY VOLTAGE - V Short-Circuit Source Current vs Supply Voltage 200 160 120 OUT CONNECTED 2.5 3 3.5 4 4.5 TOTAL SUPPLY VOLTAGE - V TSM921_24DS r1p0 100 0 100 5.5 5 TSM921-TSM924 Response Time For Various Input Overdrives (High-to-Low) ...
Page 10
... Comparator C Inverting Input Comparator C Noninverting Input Comparator D Inverting Input Comparator D Noninverting Input Ground. Connect to V- for single-supply operation. Comparator D Output. Sinks and sources current. Swings from V+ to GND. Comparator C Output. Sinks and sources current. Swings from V+ to GND. FUNCTION TSM921_24DS r1p0 RTFDS ...
Page 11
... BLOCK DIAGRAMS TSM921_24DS r1p0 TSM921-TSM924 Page 11 RTFDS ...
Page 12
... Comparator Output comparators The TSM921 and the TSM924 have a GND pin that allows the output to swing from V+ to GND while the V- pin can be set to a voltage below GND as long as voltage. ...
Page 13
... For the TSM923, the hysteresis is the same for both comparators. Hysteresis (TSM922 and TSM924) Relative to adding hysteresis with the HYST pin as was done for the TSM921 and the TSM923, the circuit in Figure 3 uses positive feedback along with , is voltage across two external resistors to set the desired hysteresis for the TSM924 ...
Page 14
... TYPICAL APPLICATION CIRCUITS Auto-Off Power Source A timed auto power-off circuit can be designed as shown in Figure 4 where the output of the TSM921 is the switched power-supply output. With an internal reference, hysteresis, high current output, and a 2.5 μA supply current, the TSM921 provides a ...
Page 15
... Calculating R2. As the input voltage V 5. Calculating R3. low undervoltage TSM921-TSM924 (TSM921 and TSM923)”, determine the desired hysteresis and select resistors R4 and R5 accordingly. This circuit has ±5mV of hysteresis at the input where the input voltage V will appear larger due to the IN input resistor divider. ...
Page 16
... Page 16 Bar-Graph Level Gauge A simple four-stage level detector is shown in Figure 6 using the TSM924. Due to its high output source capability, the TSM921 is perfect for driving LEDs. When all of the LEDs are on, the threshold voltage is set by resistors R1 and R2 where R2)/R1 volts. All other threshold voltages are scaled down accordingly by ¾ ...
Page 17
... Lead span/stand off height/coplanarity are considered as 3. special characteristic (s). 4. Controlling dimensions are in mm. 5. This part is compliant with JEDEC specification MS-012 Lead span/stand off height/coplanarity are considered as 6. Special characteristic. TSM921_24DS r1p0 (N.B., Drawings are not to scale) 5.80 – 6.20 LEADFARME 1 THICKNESS 0.19 – 0.25 1.32 – 1.52 GAUGE PLANE 0.25 0.10 – ...
Page 18
... LEAD SPAN/STAND OFF HEIGHT/COPLANARITY ARE CONSIDERED AS SPECIAL CHARACTERISTIC. Page 18 (N.B., Drawings are not to scale) 0.127 3.10 Max 5.08 Max 2.90 Min 4.67 Min 0.25 DETAIL “A” 0.95 Max 0.75 Min SEATING PLANE 0.15 Max 0.05 Min 0.38 Max 0.28 Min 0.23 Max 0.13 Min 0.27 REF GAUGE PLANE 0.70 Max 0.40 Min DETAIL ‘A’ 0.23 max 0.13 Min TSM921_24DS r1p0 RTFDS ...
Page 19
... Drawings are not to scale) 0.25 GAUGE PLANE 6.20 Max 3.99 Max 5.80Min 3.81 Min ( 1.75 Max 0.25 Max O.10 Min 0.10 Max 0.79 Max 0.69 Min 7' TYP ALL SIDE 0.863 Max DETAIL ‘A’ 0.406 Min 3.89 Max 3.73 Min 0.48 Max 0.28 Min 45' Angle 3.99 Max 3.81 Min 0.25 Max 0.19 Min DETAIL ‘A’ Page19 TSM921_24DS r1p0 RTFDS ...