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ST21S07ACW Scheda tecnica(PDF) 2 Page - STMicroelectronics |
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ST21S07ACW Scheda tecnica(HTML) 2 Page - STMicroelectronics |
2 / 10 page ST21S07A 2/10 PIN CONFIGURATION PIN DESCRIPTION PlN N° (TSSP20) PlN N° (SO-16L) SYMBOL NAME AND FUNCTION 1 1 TERMPWR1 Termination Power 1: Should be connected to the SCSI TERMPWR line. Must be decoupled with either a 2.2 µF or 4.7µF. See Fig. 2. 2 HS-GND Heat Sink Ground: Internally connected to the mounting pad. Should be either grounded or electrically isolated from the other circuitry. 32 R1 Signal Termination 1: 110 Ω Termination 43 R2 Signal Termination 2: 110 Ω Termination 54 R3 Signal Termination 3: 110 Ω Termination 65 R4 Signal Termination 4: 110 Ω Termination 76 R5 Signal Termination 5: 110 Ω Termination 8 HS-GND Heat Sink Ground: Internally connected to the mounting pad. Should be either grounded or electrically isolated from the other circuitry. 97 VREF1 Reference Voltage 1: Must be external connected directly to the VREF2 pin. Must be decoupoled with 4.7 µF capacitor as shown in Figure 2 10 8 GND Ground: Signal groud: 0V 11 9 TERMPWR Termination Power21: Should be connected to the SCSI TERMPWR line. Must be decoupled with either a 2.2 µF or 4.7µF. See Fig. 2. 12 HS-GND Heat Sink Ground: Internally connected to the mounting pad. Should be either grounded or electrically isolated from the other circuitry. 13 10 R6 Signal Termination 6: 110 Ω Termination 14 11 R7 Signal Termination 7: 110 Ω Termination 15 12 R8 Signal Termination 8: 110 Ω Termination 16 13 R9 Signal Termination 9: 110 Ω Termination 17 14 NC Not connected: Do not connect any signal to this pin 18 HS-GND Heat Sink Ground: Internally connected to the mounting pad. Should be either grounded or electrically isolated from the other circuitry. 19 15 VREF2 Reference Voltage 2: Must be external connected directly to the VREF1 pin. Must be decoupoled with 4.7 µF capacitor 20 16 PD Power Down: When tied low, the ST21S07A enters a power down mode. Contains an internal 60K pull-up. Strap low to deactivate the ST21S07A, leave open circuited to activate the ST21S07A SO-16L TSSOP20 |
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