Counter ICs

A Shift Register is a sequential logic device made up of a cascade of flip-flops, through which a sequence of bits are ’shifted’. These devices are commonly used to convert between serial and parallel interfaces.

How it works – basic example

In a Shift Register the output of each flip-flop is connected to the input of the next flip-flop in the cascade. With each cycle of the connected clock, the bits are ’shifted’ down the cascade by one flip-flop.

A simple analogy to understand the basic theory or operation would be to consider a glass tube with an opening both ends, and placing a ball marked ’0’ or ’1’ into one end of the tube at a regular intervals.

As each ball is placed into the tube, all the balls are ’shifted’ along by one position. The sequence in which the balls marked ’0’ and ’1’ where fed in is preserved. Also each time one ball is fed in, the ball that has been in the cascade the longest drops out. So if the tube can contain 4 balls at any one time, this could be described as a 4-bit Shift Register.

Common Types of Shift Register

• Serial-in serial-out (SISO) – In this type of Shift Register, the data input and output is serial. With each clock cycle a new bit is fed into the cascade, with the bit furthest along the cascade exiting as an output. So in a 4-bit register, the output trails the input by 4 clock cycles. This matches the simple example above, with the ball that exits the tube being the output.

• Serial-in parallel-out (SIPO) – In this configuration data is converted from serial into parallel format. As described for the SISO variant above, data is fed in serially and shifted down the cascade, the difference is that each flip-flop has an output, allowing the entire bit array to be output simultaneously as a parallel output. This may be done using a latched of buffered output.

• Parallel-in serial-out (PISO) – This variant takes a parallel input and converts into a serial output. To do this the shift register must implement a write/shift sequence. The parallel data input is (written) into each flip-flop of the array simultaneously in one clock cycle, then for the next cycles the register goes into shift mode as the bits are shifted down the flip-flop cascade, being output as serial data. The process then repeats.

• Parallel-in parallel-out (PIPO) – This type of register differs slightly from the others in that inputs and outputs of each flip-flop in the array are not interconnected. Each flip-flop takes one bit of the parallel input, stores it for a cycle, and then outputs the data simultaneously with the other flip-flops in the register, creating a parallel output that matches the input. Like the SISO type above, PIPO variants can be used to temporarily store data, or act a time delay device.

• Universal Shift Register – A configurable Shift Register that can be programmed to act as a SISO, SIPO, PISO or PIPO device, often on the fly.

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Description Price Package Type Logic Function Number of Stages Logic Family Mounting Type Counter Type Operation Mode Number of Elements Pin Count Minimum Operating Supply Voltage Maximum Operating Supply Voltage Dimensions Length Width
RS庫存編號 802-1418
製造零件編號74VHC595M
HK$4.573
毎管:48 個
單位
SOIC Shift Register 9 VHC Surface Mount - Serial to Parallel 1 16 2 V 5.5 V 9.9 x 3.9 x 1.45mm 9.9mm 3.9mm
RS庫存編號 166-2453
製造零件編號MM74HC595MX
HK$1.63
個 (在毎卷:2500)
單位
SOIC Shift Register 8 74HC Surface Mount - Serial/Parallel 1 16 2 V 6 V 10 x 4 x 1.5mm 10mm 4mm
RS庫存編號 739-0136
製造零件編號MM74HC595MX
HK$4.88
/個 (每包:5個)
單位
SOIC Shift Register 8 74HC Surface Mount - Serial/Parallel 1 16 2 V 6 V 10 x 4 x 1.5mm 10mm 4mm
RS庫存編號 163-2475
製造零件編號MC74HC595ADR2G
HK$1.077
個 (在毎卷:2500)
單位
SOIC Shift Register 8 HC Surface Mount - Serial to Serial/Parallel 1 16 2 V 6 V 10 x 4 x 1.5mm 10mm 4mm
RS庫存編號 145-2818
製造零件編號MC74HC595ADG
HK$3.11
毎管:48 個
單位
SOIC Shift Register 8 HC Surface Mount - Serial to Serial/Parallel 1 16 2 V 6 V 10 x 4 x 1.5mm 10mm 4mm
RS庫存編號 178-7550
製造零件編號MC14017BDR2G
HK$1.36
個 (在毎卷:2500)
單位
SOIC Counter, Divider 5 4000 Surface Mount Decade Up Counter 1 16 3 V 18 V 10 x 4 x 1.5mm 10mm 4mm
RS庫存編號 518-8745
製造零件編號MC14017BDR2G
HK$4.23
單位
SOIC Counter, Divider 5 4000 Surface Mount Decade Up Counter 1 16 3 V 18 V 10 x 4 x 1.5mm 10mm 4mm
RS庫存編號 806-3131
製造零件編號MC14017BDG
HK$3.85
/個 (每包:25個)
單位
SOIC Counter 5 CMOS Surface Mount Decade Up Counter 1 16 -0.5 V 18 V 10 x 4 x 1.5mm 10mm 4mm
RS庫存編號 689-8727
製造零件編號MC74HC595ADR2G
HK$3.698
/個 (每包:5個)
單位
SOIC Shift Register 8 HC Surface Mount - Serial to Serial/Parallel 1 16 2 V 6 V 10 x 4 x 1.5mm 10mm 4mm
RS庫存編號 689-8724
製造零件編號MC74HC595ADG
HK$4.19
/個 (每包:5個)
單位
SOIC Shift Register 8 HC Surface Mount - Serial to Serial/Parallel 1 16 2 V 6 V 10 x 4 x 1.5mm 10mm 4mm
RS庫存編號 806-1432
製造零件編號MC74HC165ADG
HK$3.05
/個 (每包:48個)
單位
SOIC Shift Register 8 MC74 Surface Mount - Serial/Parallel to Serial 1 16 2 V 6 V 10 x 4 x 1.5mm 10mm 4mm
RS庫存編號 806-3191
製造零件編號MC14060BDR2G
HK$3.04
/個 (每包:25個)
單位
SOIC Counter 14 MC140 Surface Mount Binary Up Counter 1 16 3 V 18 V 10 x 4 x 1.5mm 10mm 4mm
RS庫存編號 163-0525
製造零件編號MC14020BDG
HK$4.40
毎管:48 個
單位
SOIC Counter 14 CMOS Surface Mount Binary Up Counter 1 16 -0.5 V 18 V 10 x 4 x 1.5mm 10mm 4mm
RS庫存編號 186-9097
製造零件編號MC74HCT595ADTG
HK$3.113
毎管:96 個
單位
TSSOP Shift Register 8 HCT Surface Mount - Serial to Parallel - 16 4.5 V dc 5.5 V dc 5.1 x 4.5 x 1.05mm 5.1mm 4.5mm
RS庫存編號 761-3965
製造零件編號MM74HC595MTCX
HK$3.27
/個 (每包:10個)
單位
TSSOP Shift Register 8 74HC Surface Mount - Serial to Parallel 1 16 2 V 6 V 5 x 4.4 x 0.9mm 5mm 4.4mm
RS庫存編號 186-9084
製造零件編號MC14526BDWG
HK$6.51
毎管:47 個
單位
SOIC Counter 1 - Surface Mount Divide-By-N Down Counter - 16 3 V dc 18 V dc 10.45 x 7.6 x 2.4mm 10.45mm 7.6mm
RS庫存編號 178-4722
製造零件編號MC14060BDG
HK$3.77
毎管:48 個
單位
SOIC Counter, Divider 14 4000 Surface Mount Binary Up Counter 1 16 3 V 18 V 10 x 4 x 1.5mm 10mm 4mm
RS庫存編號 163-0526
製造零件編號MC14022BDG
HK$4.00
毎管:48 個
單位
SOIC Counter 4 MC140 Surface Mount Octal - 1 16 3 V 18 V 10 x 4 x 1.5mm 10mm 4mm
RS庫存編號 806-3129
製造零件編號MC14015BDG
HK$3.324
/個 (每包:20個)
單位
SOIC Shift Register 4 CMOS Surface Mount Divide-By-N Serial/Parallel 2 16 -0.5 V +18 V 19.55 x 6.85 x 3.43mm 19.55mm 6.85mm
RS庫存編號 163-0527
製造零件編號MC14029BDR2G
HK$1.75
個 (在毎卷:2500)
單位
SOIC Counter 4 CMOS Surface Mount Binary, Decade Down Counter, Up Counter 1 16 -0.5 V 18 V 10 x 4 x 1.5mm 10mm 4mm