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PDF TC7MBL3245BFK Data sheet ( Hoja de datos )
| Número de pieza | TC7MBL3245BFK | |
| Descripción | Octal Low Voltage Bus Switch | |
| Fabricantes | Toshiba Semiconductor | |
| Logotipo |  |
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TC7MBL3245BFT/FK
TOSHIBA CMOS Digital Integrated Circuit Silicon Monolithic
TC7MBL3245BFT, TC7MBL3245BFK
Octal Low Voltage Bus Switch
The TC7MBL3245B provides eight bits of low-voltage,
high-speed bus switching in a standard ’245 device pinout. The
low ON-resistance of the switch allows connections to be made
with minimal propagation delay and while maintaining CMOS
low power dissipation.
The device comprises a single 8-bit switch. When output enable
( OE ) is low, the switch is on and port A is connected to port B.
When OE is high, the switch is open and a high-impedance
state exists between the two ports.
All inputs are equipped with protection circuits to guard
against static discharge.
Features
• Operating voltage: VCC = 1.65~3.6 V
• Low capacitance: CI/O=19pF Switch On (typ.) @3V
• Low ON-resistance: RON = 4 Ω (typ.) @3V
• ESD performance: Machine model ≥ ±200 V
Human body model ≥ ±2000 V
• Power-down protection for inputs ( OE input only)
• Package: TSSOP20,VSSOP (US20)
• Pin compatible with the 74xx245 type
Pin Assignment (top view)
TC7MBL3245BFT
TC7MBL3245BFK
Weight:
TSSOP20-P-0044-0.65A
VSSOP20-P-0030-0.50
: 0.08 g (typ.)
: 0.03 g (typ.)
www.DataSheet4U.com
NC 1
A1 2
A2 3
A3 4
A4 5
A5 6
A6 7
A7 8
A8 9
GND 10
20 VCC
19 OE
18 B1
17 B2
16 B3
15 B4
14 B5
13 B6
12 B7
11 B8
(top view)
NC-No Internal Connection
1 2007-10-19
1 page  
TC7MBL3245BFT/FK
Rise and Fall Times (tr / tf) of the TC7MBL3245B I/O Signals
The tr(out) and tf(out) values of the output signals are affected by the CR time constant of the input, which consists of
the switch terminal capacitance (CI/O) and the on-resistance (RON) of the input.
In practice, the tr(out) and tf(out) values are also affected by the circuit’s capacitance and resistance components other
than those of the TC7MBL3245B.
The tr / tf (out) values can be approximated as follows. (Figure 4 shows the test circuit.)
tr / tf out (approx) = - ( CI/O + CL ) ･ (RDRIVE+ RON) ･ ln ( ( ( VOH – VOL ) – VM) / ( VOH – VOL ) )
Calculation example:
where, RDRIVE is the output impedance of the previous-stage circuit.
tr out (approx) = - ( 19+ 15 )E-12 ･ ( 120 + 4) ･ ln ( ( ( 3.0 - 0 ) – 1.5 ) / ( 3.0 – 0 ) )
≈ 3.0ns
Calculation conditions:
VCC = 3.0V , CL = 15pF , RDRIVE = 120Ω(output impedance of the previous IC), VM = 1.5V(VCC / 2)
Output of the previous IC = digital (i.e., high-level voltage = VCC; low-level voltage = GND)
Previous IC
RDRIVE
Measure
Waveform generated without the TC7MBL3245B
VCC
GND
www.DataSheet4U.com
Previous IC
RDRIVE
RDRIVE = output impedance of the previous IC
TC7MBL3245B
An/Bn
CI/O
(Switch On)
Bn/An
RON
Waveform generated with the TC7MBL3245B added
Measure
VM
tr out
VM
tf out
VOH
VOL
RDRIVE = output impedance of the previous IC
Parameter
VM
3.3 ± 0.3 V
VCC / 2
Figure 3 Test Circuit
VCC
2.5 ± 0.2 V
VCC / 2
1.8 ± 0.15 V
VCC / 2
5 2007-10-19
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet TC7MBL3245BFK.PDF ] | |
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| TC7MBL3245BFK | Octal Low Voltage Bus Switch | Toshiba Semiconductor |
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